Automatic Transmission - 4L60-E/4L65-E/4L70-E - Overhaul: Diagnosis Chevrolet Silverado 1500

Case Assembly Inspection

1. Inspect the spacer plate to case gasket for witness marks. The witness marks should be complete. Incomplete witness marks may come from an uneven case surface or from cross channel leaks.
2. Using compressed air, blow into all of the case fluid passages (3, 7, 8, 11, 16, 18, 26, 29, 37, 45) to ensure that all case fluid passages are clear of any obstruction.
3. Inspect the 2-4 servo bore, the 3rd accumulator retainer and ball assembly (40), the orifice cup plug (11) in the servo bore, and the 2nd apply piston pin bore for any of the following conditions: Porosity Burrs Debris Any other damage
4. Inspect the 3-4 accumulator bore and the orifice cup plug (38) for any of the following conditions: Porosity Burrs Blockage Any other damage
5. Inspect all bolt holes for thread damage. Use heli-coil to repair damaged threads.
6. Inspect the cooler connectors for damage and proper torque. Specification: Cooler connector torque should be 38 N.m (28 lb ft)

Reaction Gear and Carrier Inspection

1. Inspect the reaction carrier/support thrust bearing assembly (683) for wear or damage.
2. Inspect the reaction gear support to case bearing (692) for wear or damage.
3. Inspect the internal reaction gear (684) and the internal reaction gear support (685) for proper assembly, stripped splines, cracks, teeth, and lug damage.
4. Check the reaction carrier pinion end play. The end play must not exceed 0.61 mm (0.024 in). Inspect the reaction carrier for the following conditions: Pinion gear damage Proper pinion staking Excessive pinion washer wear Keystoned pinion gears
5. Ensure that the pinions turn freely.
6. Inspect the reaction carrier captive thrust bearing for wear or damage. Without touching the pinion gears, place a bushing or an output shaft sleeve (690) onto the bearing race, and turn it with the palm of your hand. Any imperfections will be felt through the bushing.

Input Carrier Inspection

1. Check the input carrier pinion end play. The end play must not exceed 0.61 mm (0.024 in).
2. Inspect the input carrier for pinion gear damage, proper pin stake and keystoned pinion gears. Pinions must rotate freely.

Input Carrier Inspection and Installation

1. Inspect the input carrier captive thrust bearing assembly. To check the captive thrust bearing in the input carrier (662) for wear, place a bushing or an output shaft sleeve (690) onto the bearing race and turn it with the palm of your hand. Do not touch the pinion gears. Any imperfections will be felt through the bushing.
2. Install the input carrier assembly (662) onto the output shaft. The carrier assembly can be either a 4 or 5 pinion design, depending on model.
3. Install a new output shaft to input carrier retainer (661).
4. Remove the J 29837-A . See «Special Tools»(ref-246428-S04847512592006122100000) .

Input Housing and Shaft Assembly Inspection

1. Inspect the input housing and shaft assembly for the following conditions: Porosity Spline wear - internal and external Input speed sensor models, rotor teeth for cracks or damage Three turbine shaft ball check valves are present and move freely Retainer and ball check valve assembly (620) Orificed cup plug (698) Lube hole cracks
2. Test the input housing for cracks by tapping housing with wooden handle. Housing should produce a sharp ring.
3. Inspect the turbine shaft oil seal ring (619) grooves for damage or burrs. The oil seal rings (619) must fit loose into the ring grooves.
4. Inspect the oil feed passages for obstructions.
5. Apply compressed air into the passages indicated.

Inspection Procedure

Scheme 447

Apply air into the feed holes in the turbine shaft in order to check the following items

1. The 3rd and 4th clutch (1)
2. The forward clutch (2)
3. The overrun clutch (3)

1. Inspect the valve body to spacer plate gasket for valve body channel witness marks. The witness marks should be complete. Incomplete witness marks may be caused by an uneven case surface. Incomplete witness marks may also be caused by cross-channel leaks.
2. Inspect the valve body casting for the following conditions: Porosity Cracks Damaged machined surfaces Chips or debris