Let us know what you find, it would be great if the problem is simple to fix. This Actuator has replaced the previous Throttle Valve Cable and all associated linkage. The entire transmission of torque is applied to the rear planetary gearset only. This facilitated the development of a load adaptive shift strategy - the ability to alter the shift schedule in response to vehicle load condition. If two members of the same planetary set are driven, direct drive results. First through fourth gear are obtained by selectively applying and releasing the different clutches and bands.
Diesel and heavy-duty gasoline applications include new lock-up lining. At low pump speeds, the flow is controlled by the pressure valve groove to reduce pressure to the torque converter. As the land meters the fluid to the sump, it causes the pressure to reduce and the spring decreases the size of the metering passage. Hold bracket firmly against spring tension while removing last screw. The pressure regulator valve train controls the maximum pressure in the lines by metering the dumping of fluid back into the sump.
Using the same forces and areas as in the previous example, the smaller piston Fig. Replace the piston if chipped or cracked. Please let us know how your troubleshooting unfolds. Could you expound on what the purpose of that shim is and how it might affect the od operation? The clockwise rotation of the sun gear causes the rear planet pinions to rotate against engine rotation in a counterclockwise direction. The solenoid contains a check ball that opens and closes a vent port in the 3-4 shift valve feed passage.
All stock no chips- no previous mods -very little towing one hand times to haul cattle. You are not experiencing issues with up- and down-shifts in those three forward gears and reverse that operate. Master kit with all friction and steel plates, 2. Be sure gasket is properly aligned 12 Tighten front band adjusting screw until band with fluid passages in case Fig. Front Clutch Pack Information The front clutch assembly is composed of the front clutch retainer , pressure plate, clutch plates, driving discs , piston , piston return spring , return spring retainer, and snap-rings. Install spring and washer 3 Disengage cable eyelet at transmission shift on rod.
Otherwise, engine runaway or a shift hesitation will occur. One nagging thought is the shim for the overdrive, as I did not have shims , I installed the existing one. Weak prospect here, this would be a whole new issue. Replace the overrunning clutch roller and spring assembly if any rollers or springs are worn or dam- aged, or if the roller cage is distorted, or damaged. We recommend upgrading the input shaft for any customer towing or racing their truck. Hydraulic Pressure Low: Pressure test transmission to determine cause.
Engagement is according to the third gear converter clutch engagement schedule. This means you start the truck up, let it idle for a time in Park, and if the anti-drainback valve is defective and allowing fluid to drain from the converter, the front pump bushing is running dry the whole time. When the shift takes place, the front band is released, and the front clutch is applied. It is also sent to the reaction areas on the left side of the throttle pressure plug and the line pressure plug. I certainly appreciate your advise as I am certainly not a tranmission technofile, as per your above communication, I only want to keep the truck running as it is the devil I know or am coming to know. I'm crossing fingers that an easier fix will work, but if necessary, you have the full list of possibilities at your disposal! Replace the springs if the coils are cracked, distorted or collapsed What are the bands everyone keeps talking about and what do they do? Of course it's work to remove and strip down the valve body again. Polish the hub and notches mounting bracket.
Again, if vehicle speed is low enough, throttle pressure will also push the 1-2 shift valve left to seat its governor plug, and downshift to drive breakaway. I am curious because I have high back pressure at the cooler when the thermostatic coupler closes and directs fluid through the cooler. As the gears rotate, clearance between gear teeth The oil pump Fig. The output shaft in turn rotates with the annulus gear in a counterclockwise direction giving a reverse gear output. Inspect the accumulator piston and seal rings.
The release spring also helps to cushion the application of the clutch assembly. Unlike our competition, we do not leave optional upgraded parts out when we build our units. Valve Body Valve Stuck: Repair stuck 3-4 shift valve, 3-4 timing valve. Do you have the stock trans cooler or an aftermarket unit? The rear clutch stays applied as it has been in all the forward gears. This is a possibility whenever a valve body has been apart and put back together. The base design from the original Torqueflite remains largely unchanged and the addition of a 2-speed output shaft overdrive unit that is bolted to the back of the 3-speed transmission has only two ratios: direct 1:1 and overdrive. Best of all, the price is low.
Keep filter screws separate from other valve body screws. The rear annulus gear is splined to the output shaft and rotated along with it clockwise in an underdrive gear reduction mode. . Fluid pressure reacting on the area of land 1 overcomes governor pressure, downshifting the 2-3 shift valve into the kickdown, or second gear stage of operation. The overdrive clutch discs are attached to the overdrive clutch hub while the overdrive clutch plates, reaction plate, and pressure plate are lugged to the overdrive housing. Line pressure on the 3-4 shift valve overcomes valve spring pressure moving the valve to the upshift position.
Since the overdrive clutch is applied in fourth gear only and the direct clutch is applied in all ranges except fourth gear, the transmission operation for park, neutral, and first through third gear will be described first. The customer is responsible for insuring that the vehicle has the proper safety related items in place for safe operation. The 3-4 accumulator cushions overdrive clutch engagement to smooth 3-4 upshifts. If that's not the cure, I will troubleshoot the cause further governor solenoid and some other possibilities and eliminate the harsh downshifts when the transmission is warmed and the truck is coming to a stop. Question: Did you eliminate the anti-drainback valve when modifying the valve body with the Sonnax upgrades? If converter hub is scored, either polish it with crocus cloth or replace converter. The second gear shift is obtained by keeping the rear clutch applied and applying the front kickdown band. Again, not part of your work or initial problem, another weak prospect.