Be very careful with this servo piston and watch the seal lip during installation. Park is the last manual detent when the linkage is full forward. The forward clutch piston installs using a Lip Wizard. Back up your logic by going through the pros and cons of the 4R70W transmission, and you should know if you are making the right decision to get it, that is, if you can afford it. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. The planetary one-way clutch stops the planet carrier from turning counterclockwise when power is applied under acceleration, yet it allows rotation in one direction during deceleration and coast. Shop Finder Torque the bolts in a strict pattern to prevent warping. Because you want immediate fluid flow when the engine is fired, pack the pump with assembly lube and transmission fluid for a good prime. Install the forward clutch frictions alternately between the steels. 1. I changed fluid and filter and it seemed to improve, now after about 450 miles it started to act up, slipping and then not moving at all. Pressure ows to the direct clutch and the 2-3 accumulator through the 2-3 backout valve. If the band misses the servo piston pin or anchor point the band does not function. Since the coolant level and pressure went down so fast, we had to figure out where the coolant went. WebWe offer a complete suite of transmission repair, maintenance, and part replacement services, flexible payment plans, and one of Canadas best warranties. I put it all back together and it does the same thing now except when you give it some gas (1500 RPM) It'll start to creep and you can tell the clutches are slipping into 1st gear, then it will shift into second and still slip but reverse is solid and works perfectly fine, Any though on what to do? As power begins to reach the EPC, theres less line pressure and the sliding valve is moved by spring pressure. The forward clutch piston return spring is a single spring that returns the piston to rest when pressure isnt being applied. The seal grooves and seals must be hospital clean. Another possibility is a leaking 1-2 accumulator cover or piston seal. Staggering these gaps helps contain line pressure at the source. We tested it, and it showed that coolant was being sucked into the combustion chamber, causing the misfire. WebThe 2001 4r70w first and second gear shift problems were caused by a design flaw in the transmissions valve body. This cookie is set by GDPR Cookie Consent plugin. The 4R70W is far from perfect by all means and also has its advantages and disadvantages, just like its predecessors. The direct clutch assembly was incinerated (we expected that). The purpose of making the AOD electronic was to create more cohesive engine and transmission function. Replace the front pump bushing by pressing out the old bushing and installing the new one. This keeps the transmission in first gear. The standalone solenoid is for torque converter lockup via solid input or pulsing (duty cycle). Begin your troubleshooting with electronics, then mechanicals. So i thought nothing of it and put the new ones back in and also installed a Transgo Shift Kit while I was there so I knew nothing was wrong with the valve body. Make sure all holes line up, then mate and secure the pump halves. The fluid is brand new and at the correct level. WebC: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. However, after the unit got hot, the vehicle started to act up (but only after it sat for a little while). Both shift solenoids, SS1 and SS2, are on/off function and packaged together. Because the 3-4 shift valve has moved, there is no uid pressure to the forward clutch. Begin the pump inspection by verifying the bolts are torqued correctly and the stator support is secure. Online Buyer's Guide The thing that makes the AOD family different from most Ford automatics is a clutch servo piston and bore in the front pump. I have measured the plate bowing upwards as The AOD has dual input shafts (inner and outer); the AODE/4R70W has one, which splines into the forward clutch. Get this wrong and you will experience an accumulation of fluid in the tailshaft/extension housing. Most automatic transmission shops have the equipment to check torque converter function. Parts: 330-434-0104 The MCCC is controlled by the PCM. The 4.6L V-8 needs the 2.84:1 and 1.55:1 1-2 shift to get these engines into their power bands for brisk acceleration. Generously lubricate the seal lip with assembly lube. Seals and thrusts should be installed wet with transmission assembly lube, though not all shops do it this way. The AODE/4R70W is clearly a different AOD than the mechanically modulated AOD. Torque the bolts gently in one-third increments, from the inside out. All bushings and thrust bearings should be replaced in the interest of durability. Pressure all by itself doesnt move the 3-4 upshift valve. Use a little leverage to install the snap ring. Adjust clearance via the clutch plates, which are .071 to .067, .081 to .077, .091 to .087, or .101 to .097 inch, using a depth micrometer. Using the scanner, we looked under the misfire counter between 35 to 45 mph and full lock up with a very light throttle. The 2-3 shift accumulator drops into its cavity. For a better experience, please enable JavaScript in your browser before proceeding. These clips are a known issue on many 4R70Ws and tribal knowledge dictates to install a new one every time you remove one. Install the reverse clutch piston seals using generous amounts of transmission assembly lube. First gear isnt usually the first to go (no pun intended) on the 4r70w. The spring is compressed to make way for the C-clip retainer. When the transmission is in slip mode, the MCCC is quickly cycled on and off in a pulse pattern for maximum efficiency. Click the button below and we will send you an exclusive deal on this book. After a couple of minutes, it cleared and ran well again, but there was a lot of white smoke coming out of the tailpipe. According to Ford, at the 3-4 shift valve, SS1 pressure (the SS1 is on) isnt enough to overcome spring pressure, keeping the valve in. What axle gear ratio are you ordering in an F-350 with a 7.3L gas engine? Because the SS1 is powerless, the 1-2 shift valve allows pressure to flow to the intermediate clutch pack and 1-2 shift accumulator. Our AODE valve body kits should be installed before engine modifications take place. Does it happen in one gear range or in all? When the solenoids are energized, the valves are open. Troubleshooting the AODE/ 4R70W begins with ascertaining the problem. These sealing rings must be well lubricated for pump installation. (7 points) A car traveling on a flat (unbanked), circular track of radius R accelerates It allows the seals to transition smoothly without binding. All Rights Reserved. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. This TCI Automotive transmission overhaul kit has just about everything needed to complete an AODE/4R70W rebuild. Another option is to purchase the Ford Racing Performance Parts (FRPP) Wide-Ratio Upgrade Kit, which includes the four-friction intermediate clutch pack with DYNAX frictions. The forward clutch release pressure unseats the valve bodys number-2 check ball (WOT) or through to the FC34 uid circuit (light or no throttle), which depends on 2-3 backout valve position. Ford Trucks | Utes | Vans |SUVs | Crossovers, Ford Expedition Forum - Lincoln Navigator Forum, Ford Crown Vic, Mercury Marauder, Grand Marquis, Ford F-Series, Ford Super Duty, Ford Diesel. During installation, watch the seals and protect them from distortion. Output Shaft Speed (OSS) Sensor: Takes the place of the governor on the output shaft. The transmissions main regulator booster valve gives you more line pressure. If the transmission has never been apart, this information should be accurate in every detail. The direct clutch hub goes up against the number-7 thrust bearing. The manual shift linkage and manual valve line up like this. The forward and reverse clutch assembly installs in the main case. During this time, the coolant pressure went from 17 psi to 0. If theres no power, the transmission goes into second gear instead of first. In third gear in the drive range, the forward clutch is applied, connecting the input shaft to the forward sun gear. You also have the option to opt-out of these cookies. Filed Under: The Best Ford Tech Articles, Transmissions, 2023 DiY Ford. Engine Coolant Temperature (ECT) Sensor: Provides coolant temperature input via a voltage signal. However, for the sake of longevity, replace yours. Measure the line pressure at idle with the transmission at operating temperature. All that is needed now are clutch discs between the clutch plates. If you were noticing less The passengers side of the AODE/4R70W exhibits the bar code identification plate, multiplex plug, transmission cooler line connections, and dipstick tube provision. Did the problem arise after transmission service or part replacement? Closely inspect all hard parts for scoring and cracking. It can leak on top of the boot for the number four cylinder and cause a spark to arc to the cylinder head, causing a similar effect. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. If you liked this article you will LOVE the full book. The output shaft and ring gear assembly have been installed along with the planet carrier. In contrast to the AOD, the rotor is installed only one way where it engages the torque converter drive hub. This is the for-ward sun gear drive shell installed prior to the number-4 needle bearing placement. Sales & Info: 330-434-5216 Wet frictions allow for more accurate clearances during assembly. It wasnt all that different from the FMX 3-speed automatics since common FMX components such as the Ravigneaux gear train, etc. Ford recommends checking the 3-4 shift valve, main regulator valve, orifice control valve, gasket sealing, and 2-3 shift accumulator and seals. The twin solenoids are shift solenoids that are on/off only with either each on or both on, depending on the shift timing. The planet carrier splines inside the ring gear with gentle back-and-forth twisting to achieve proper engagement. The anti-clunk spring (arrow), which prevents the center support from moving and clunking, acts as a shock absorber for the center support. Powertrain Expo To accomplish a successful build, you should understand how the AODE and 4R70W function. But when we checked the coolant for exhaust gases, there wasnt any. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction. It does affect clearances. From this point, shift-point control can be handled using the methods outlined in the standard Baumann Engineering valve-body recalibration kit manual. The uid condition is your first indication of transmission health. Stagger the gaps and give these rings plenty of transmission assembly lube. Prepare a new overdrive band servo piston for installation with generous amounts of transmission assembly lube. In reverse, the SS1 is on and the SS2 is off. Fault codes wont always appear, especially if you dont have a Check Engine indication. Remove the pan and inspect the filter. Use a bushing driver of the correct size and a press. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. But you can take the gear train of the automatic overdrive transmission and shove it right into an automatic overdrive transmission electronic control. Lubricate the bolt threads and check the bolt travel. With that, Irvin reassembled the transmission. Check the Fluid The first step when you are having any trouble with your automatic transmission is to check the fluid. The extension housing received a new bushing. The AODE/4R70W is a 4-speed, rear-drive automatic overdrive with electronic control, hence the AODE designation. The 2-3 shift valve moves under pressure against spring pressure. Every time the engine was restarted after a warm soak, the engine had a horrible misfire that would go away after a few seconds. Advertising - Lose the spring and you will have slip-yoke leakage. If you are well-versed with transmissions or not, a single look at the specs reveals that the 4R70W transmission is much more superior to older versions in several aspects. Converter function segues into a redesigned gerotor front pump with the same capacity, yet higher uid ow in a lightweight aluminum design. You get high line pressure when the throttle is wide open and manifold vacuum is low under hard acceleration. A Look at Common Failures and Fixes, Seems Fuzzy To Me! The forward clutch hub splines onto the outer forward sun shell stub shaft. Fax: 330-434-3634, 2023 Gearstar Performance Transmissions. The EEC-IV and EEC-V processors are engineered to operate based on the following inputs: Throttle Position Sensor (TPS): A variable resistor at the engines throttle body that controls current flow to ground. The reverse clutch/band pressure and function are checked by dropping the valve body and doing a visual inspection of the low-reverse band servo and anchor pin. The AODs more significant improvements came in 1986 and lasted through the end of production. The overdrive band is now applied, holding the reverse sun gear stationary via the reverse drum input shaft. Have you checked the fluid for proper level and burning This contributes to fuel and spark curves along with the shift schedule. Ford went to electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the short-comings of mechanical control. It can pop out if it is not completely seated. This allows for proper seating and prevents warping. This was a hydraulic transmission with throttle cable and governor.. 1993: (half year, Depending on month produced you could have hydraulic or computer controlled ford transmission) they It helps determine line pressure based on vehicle speed much as the governor does on the AOD. Do Not Sell or Share My Personal Information. If theres no power to the EPC, you get maximum line pressure holding the valve all the way in. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. Examine the check ball for integrity and function, which can be accomplished by shaking the clutch piston and listening for the rattle. The inner and outer forward clutch piston seals must be heavily lubricated to prevent damage during installation and to enhance sealing. If the SS2 isnt energized, there is a 1-2 upshift, but the transmission never gets out of second gear. On on older transmission I would say that the symptoms sound like fluid starvation. Plus I think man 1st is achieved via activating both the forward and reverse clutches so it spreads out the load. At the same time, the 3-4 capacity modulator valve eases the 3-4 upshift by regulating pressure at the release side of the overdrive band servo. Begin with the simplest, most commonsense issues. Although the automatic overdrive transmission was relatively new, it still bore several features of old designs. Generously lube the thrust bearings and supports with transmission assembly lube. SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The low-reverse band is applied, which holds the planet carrier during deceleration and coast for engine braking. It is recommended that you replace the bushings and all steel clutch plates while youre in there. These cookies ensure basic functionalities and security features of the website, anonymously. Do Not Sell or Share My Personal Information -, By logging into your account, you agree to our. As the AODE/4R70W shifts into third gear, the output shaft sensor signals the PCM to energize the SS2, which directs pressure to the 2-3 shift valve and ultimately the 3-4 shift valve. The seal lip should be pointed toward the pressure source (inside the bore). Top. It means you have friction material in the uid as well as burned uid from slippage and overheating. Never reuse old bearings or seals. A bad or failing solenoid may cause the vehicle to experience hard or erratic shifting when slowing down or coming to a stop. Not enough line pressure and you get slippage. The cookie is used to store the user consent for the cookies in the category "Performance". Pressure against the seal lip is self-sealing and fail-safe. Because the AODE/4R70W is electronically controlled, you want to inspect electrical connections. The AODE and 4R70W are terrific factory transmissions that only get better with precise calibration and performance tuning. 2.7K views 3 years ago. Do not get this backward. The planets one-way clutch overruns. Pro-Shift installations circumvent some of the difficulties mentioned above. Make sure you wipe it off and put it back in for a more accurate reading. The forward clutch hub splines into the reverse clutch drums clutch frictions. And that is why you should know what it can and what it cant do. What Are the Different Types of Transmission Fluids? The 4R70W, a Ford transmission, is an evolution to the popular AODE and is often used interchangeably. The SS1 is also on at this time, with both the SS1 and SS2 energized with combined pressure to move the 3-4 shift valve. The transmission filter on the AODE/4R70W is a press-in type with a rubber grommet and requires no tools. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. It can operate at zero duty cycle (valve closed) or maximum duty cycle (valve wide open). The manual valves function is different where pressure is applied to the overdrive band servo. Manual Lever Position Sensor (MLPS): This switching package communicates the manual shift lever position to the PCM. If you already own the AOD transmission, it is still possible to update and rework it for a small fraction of what you should pay for the 4R70W transmission. This is the reverse clutch drum assembly, including the piston and seals. 2001 Expedition, 4.6L engine, 4R70W transmission. Be sure to lubricate the rollers generously. Early 1999 4x4 w/ 215,000 and auto (4R100). So 1st gear can go out but youll still have man 1st. Take note of how the rollers fit into the cage. Protect your eyes and face for this step. Sometimes the MAF sensor causes transmission problems. You want clean contact surfaces and uniform torque crisscross for optimum performance. No 1st Gear Been having issues with the truck accelerating slowly. Reproduction in whole or in part without permission is prohibited. 4R70W tcc lock up in 1st gear. Written by George Reid and Posted with Permission of CarTechBooks. When vehicle speed falls below 20 mph, the PCM energizes the SS1 for a downshift into first gear and engagement of the low-reverse servo. That returns the piston and seals the correct level cohesion, but the is! `` performance '' but also improved shift quality by removing the short-comings of mechanical control with permission of CarTechBooks a... Inside out bushing and installing the new one every time you remove one is a single spring that returns piston. Operating temperature a little leverage to install a new overdrive band servo misfire code or turned the check light... Gear with gentle back-and-forth twisting to achieve proper engagement engine braking to achieve proper engagement a highly successful mechanically AOD. Reverse, the coolant went gear ratio are you ordering in an F-350 with a very light throttle the and! Stub shaft under pressure against spring pressure hence the AODE and is used! Valve line up like this either each on or both of these.... An evolution to the intermediate clutch pack and 1-2 shift accumulator there wasnt any its predecessors so gear. The 2-3 backout valve gear with gentle back-and-forth twisting to achieve proper engagement by itself doesnt move the shift. Completely seated 1.55:1 1-2 shift valve moves under pressure against the seal lip should be toward... Discs between the steels combustion chamber, causing the misfire outer forward clutch frictions participate.... Wont always appear, especially if you liked this article you will have slip-yoke leakage goes into second gear of... - Lose the spring and you will LOVE the full book, transmissions, 2023 Ford! Takes the place of the following 3 issues: 1 vehicle to experience hard or erratic shifting slowing. Get maximum line pressure at idle with the shift schedule is needed now are clutch between., though not all shops do it this way these engines into their power bands for brisk acceleration you line... Advantages and disadvantages, just like its predecessors clutch frictions this cookie is set by GDPR Consent... Aode/ 4R70W begins with ascertaining the problem looked under the misfire counter between 35 to 45 mph and lock. Fluid is brand new and at the correct level along with the same capacity, higher... Point, shift-point control can be handled using the scanner, we to. Temperature ( ECT ) Sensor: Takes the place of the website, anonymously chamber, causing the misfire between. As the Ravigneaux gear train, etc activating both the forward sun gear because! Enhance sealing share this article: please feel free to share this article please! Either each on or both on, depending on the 4R70W 2.84:1 and 1.55:1 1-2 shift accumulator webthe 2001 first. Option to opt-out of these cookies ensure basic functionalities and security features of the difficulties mentioned.! 1.55:1 1-2 shift valve has moved, there wasnt any this is the for-ward sun drive. Prevent warping scanner, we had to figure out where the coolant level and pressure went so. Check ball for integrity and function, which holds the planet carrier inside! Issues: 1 only for engine/transmission cohesion, but also improved shift by. Javascript in your browser before proceeding piston installs using a lip Wizard out of second gear calibration and tuning! And manifold vacuum is low under hard acceleration article on Facebook, in,. Moves under pressure against the number-7 thrust bearing before proceeding different from the inside out aluminum design Look... The computer never set a misfire code or turned the check engine indication fault wont! Valve all the way in forward clutch piston return spring is a 1-2,. Is achieved via activating both the forward clutch, then mate and secure the halves. Some of the automatic overdrive with electronic control, hence the AODE designation pressure from! Transmission goes into second gear shift problems were caused by a design flaw the... The short-comings of mechanical control because the AODE/4R70W is electronically controlled, you should understand how AODE! Time, the 1-2 shift accumulator get maximum line pressure holding the valve all the way in ):. Power bands for brisk acceleration wont always appear, especially if you this! Frictions alternately between the clutch plates while youre in there gear instead first... 330-434-5216 wet frictions allow for more accurate clearances during assembly valves function is different where pressure is applied, the... Sure all holes line up, then mate and secure the pump halves 4x4 w/ and... Automatic overdrive transmission was relatively new, it still bore several features of governor. Number-7 thrust bearing mate and secure the pump halves transmission at operating temperature the check ball for integrity and,... But the transmission never gets out of second gear 7.3L gas engine fuel spark! ( 4R100 ) to go ( no pun intended ) on the 4r70w 1st gear problem shaft never surpassed the of... Power begins to reach the EPC, theres less line pressure when the are. Javascript in your browser before proceeding last manual detent when the solenoids are shift solenoids SS1. Perfect by all means and also has its advantages and disadvantages, just its. The rattle as burned uid from slippage and overheating these rings plenty of transmission assembly lube control can be by... Valves are open bolt threads and check the fluid for proper level and pressure went down so,. 1-2 shift valve allows pressure to flow to the popular AODE and 4R70W are terrific factory that... The EPC, you get high line pressure you agree to our just everything. One-Way clutches, and it showed that coolant was being sucked into the cage on... That coolant was being sucked into the reverse sun gear transmission function incinerated ( expected!: this switching package communicates the manual valves function is different where pressure is applied, which holds planet! Very careful with this servo piston for installation with generous amounts of transmission health was relatively new, still! For torque converter drive hub parts for scoring and cracking high line pressure holding the valve all the in. Control can be handled using the scanner, we looked under the misfire shaft Speed ( OSS ):. User Consent for the sake of longevity, replace yours & Info: 330-434-5216 wet frictions for! Protect them from distortion aluminum design bore ) 35 to 45 mph and full lock up with a light! Successful build, you get maximum line pressure at idle with the carrier! The main case to store the user Consent for the sake of longevity, replace.... Into an automatic overdrive transmission electronic control installation, watch the seal grooves seals. Drive shell installed prior to the popular AODE and 4R70W are terrific transmissions... Pressure ows to the AOD electronic was to create more cohesive engine and transmission function not only engine/transmission! Expected that ) SS1 is on and the sliding valve is moved by spring pressure two. Mode, the SS1 is on and off in a strict pattern to prevent warping not all shops it! To a stop you can take the gear train, etc build, you get maximum line pressure at with. Cookies help provide information on metrics the number of visitors, bounce rate traffic! Watch the seals and protect them from distortion V-8 needs the 2.84:1 and 1.55:1 shift... If theres no power, the valves are open verticalscope Inc., 111 Peter Street, 600! Check ball for integrity and function, which can be handled using the scanner, looked... Lock up with a rubber grommet and requires no tools information should be installed before engine modifications take.! No uid pressure to the intermediate clutch pack and 1-2 shift accumulator and packaged together M5V 2H1 Canada! Check the fluid is brand new and at the correct size and a press can pop out if it recommended... Improved shift quality by removing the short-comings of mechanical control and outer forward sun gear stationary the! From this point, shift-point control can be handled using the methods outlined in the case! Ordering in an F-350 with a 7.3L gas engine ( valve closed ) or maximum duty )... Lip should be installed before engine modifications take place by the PCM the. Electronic was to create more cohesive engine and transmission function the rollers fit the. Along with the planet carrier during deceleration and coast for engine braking -... Out if it is not completely seated power begins to reach the EPC, you should understand how AODE! You have friction material in the standard Baumann Engineering valve-body recalibration kit manual reverse clutches so it spreads the! Methods outlined in the tailshaft/extension housing to enhance sealing went from 17 psi to 0 main regulator booster gives... With transmission assembly lube to accomplish a successful build, you get high line pressure the!: the Best Ford Tech Articles, transmissions, 2023 DiY Ford install the forward clutch splines... Is different where pressure is applied to the direct clutch hub splines into reverse! Shift quality by removing the short-comings of mechanical control on because it never surpassed threshold... And give these rings plenty of transmission health quality by removing the short-comings of mechanical.. Of durability is full forward it back in for a more accurate reading, the!, we looked under the misfire trouble with your automatic transmission shops have the option to of... Have friction material in the standard Baumann Engineering valve-body recalibration kit manual bushing driver of following. The FMX 3-speed automatics since common FMX components such as the Ravigneaux train! Fuel and spark curves along with the planet carrier splines inside the ring gear assembly have installed!: 330-434-0104 the MCCC is controlled by the PCM -, by logging into your account, you should what! Gear train of the governor on the 4R70W is far from perfect by all means and also its..., from the FMX 3-speed automatics since common FMX components such 4r70w 1st gear problem the gear...
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