Low-Reverse Servo

Low-Reverse Servo

1. Inspect the bore for scores.

2. Check the fluid passages for obstructions.

3. Inspect the band for distortion. Inspect the band ends for cracks.

4. Inspect the servo piston spring for distortion.

5. Inspect the band lining for excessive wear and for proper bonding to the metal band.

6. Replace damaged cover seal.






7. Replace piston seals if damaged.

8. Remove reverse band servo piston and rod from case assembly.

9. Install the reverse band servo piston and rod assembly into servo bore along with a reverse band servo spring.

10. Install new reverse servo separator plate cover gasket and Servo Rod Selecting Gauge T74P-77190-A and tighten with three attaching bolts.

11. Tighten servo tool adjusting screw to 4 Nm (35 lb-in).

12. Install Dial Indicator with Bracketry TOOL-4201-C or equivalent on transmission case and position indicator on piston pad. Set dial indicator to zero.











13. NOTE: If piston travel in this step is between 3 and 5.6mm (.120 and .220 inch), it is within specification. If piston travel is greater than 5.6mm (.220 inch), use the next longer piston and rod. If piston travel is less than 3mm (.120 inch), use the next shorter reverse band servo piston and rod.


Back out the servo tool adjusting screw until piston bottoms out on the tool. Record the distance the servo piston traveled.


14. Using the above procedure, check the piston travel with the new selected reverse band servo piston and rod (if required) to make sure that the piston travel is between 3 and 5.6mm (.120 to .220 inch).

15. Remove the servo adjusting tool and the reverse reverse band servo spring.

Length - mm Length - Inches I.D.
54/53 2.112/2.085 1 Groove
51/50 2.014/1.986 No Groove
49/48 1.915/1.888 2 Grooves

16. CAUTION: Replace the rear band servo piston oil seals if damaged.

Install the reverse band servo spring to the reverse band servo piston and rod.






17. Reinstall the reverse band servo piston and rod into the case.






18. NOTE: See the valve body screw location illustration.

Use a 10mm socket to install four number 5 length screws to attach the reverse band servo cover and reverse servo separator plate cover gasket at locations "D." Tighten to 9-13 Nm (80-115 lb-in).






19. Using needlenose pliers, connect solenoid case connector wires to torque converter clutch solenoid and 3/4 shift solenoid assembly.

20. Lubricate and install two oil screen O-rings and install oil screen on main control.






21. Use a 10mm socket to install one No. 2 length screw M6 x 45mm in location "C." Tighten to 8-11 Nm (71-97 lb-in).






22. Position a new oil pan to case gasket on case oil pan rail. Position transmission fluid pan on top of gasket. Use a 13mm socket to install eighteen M8 x 14mm screws. Tighten to 11-13 Nm (97-115 lb-in).

23. Remove the Bench Mounted Holding Fixture T57L-500-B transmission fixture arm with adapter plate from the bench fixture pivot. Place on a flat surface.






24. NOTE: A heat shield is on all 4.0L applications.

Position the heat shield onto the oil pan rail. Install retaining nut. Tighten to 8-11 Nm (71-97 lb-in).






25. Remove the fixture arm and adapter plate held on by four M10 x 30mm screws.






26. CAUTION: The governor assembly can come apart until installed in place.

Assemble the governor body, governor primary valve, governor valve spring, governor weight, governor body counterweight. Install the governor assembly to the governor oil collector body with two M6 x 20mm screws. Tighten to 9-13 Nm (84-115 lb-in).

27. NOTE: Use petroleum jelly to hold the gasket in place.

Install a new extension housing gasket on the case.











28. NOTE: The guide cup is a press fit into the extension housing and is not serviced separately.

Install the parking pawl, pawl return spring, and pawl shaft into the extension housing.






29. CAUTION: Make sure the parking lever actuating rod is correctly seated on the parking rod guide clip.

Install the extension housing to case using six M10-30mm screws, and two studs. Tighten to 36-52 Nm (27-38 lb-ft).

30. CAUTION: Tool will bottom when bushing is in proper position.

CAUTION: Lube hole in bushing must be at the bottom of the extension housing and align with the lube groove.

NOTE: Install extension housing bushing only if removed in disassembly.

Install the extension housing bushing using Extension Housing Bushing Replacer T77L-7697-F.






31. Install the extension housing seal using Extension Housing Seal Replacer T74P-77052-A.






32. CAUTION: The splines are not the same on both ends. The shaft end with the shorter spline goes into the front pump support and gear.

Install the input shaft into the front pump support and gear.











33. WARNING: THE TORQUE CONVERTER CAN FALL OUT IF THE TRANSMISSION IS TIPPED.

CAUTION: Make sure the converter hub is fully engaged in the front pump support and gear and rotates freely. Do not damage hub seal.

NOTE: Dimension "A" should be 10.23-14.43mm (7/16-9/16 inch).

CAUTION: If the torque converter slides out and back you may damage the hub seal.

Install the torque converter by pushing and rotating the converter.