Vehicle Moves In S and R, But Not In D

Vehicle moves in S and R, but not in D

Diagnostic Procedure:

1. 1st gear one-way clutch defective

2. 1st gears worn or damaged

3. 1st clutch defective

Also check for:

- Check the 1st clutch pressure. A/T Pressure Test
- Inspect the mainshaft, the countershaft, 1st gears, and the one-way clutch for wear and damage.
- Inspect the 1st clutch for wear and damage.
- Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height. If the discs and the plates are worn or damaged, replace them as a set. If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate. If they are OK, adjust the clearance with the clutch end-plate.