No Movement In Reverse or Slips In Reverse

1. Check oil level.
2. Manual control linkage improperly adjusted.
3. Vacuum modulator assembly may be defective.
4. Vacuum modulator valve sticking.
5. Strainer may be restricted or leaking at intake.
6. Regulator or boost valve in pump assembly may be sticking.
7. Low oil pressure.
8. Rear servo and accumulator may have damaged or missing servo piston seal ring.
9. Reverse band burned out or damaged. Determine that apply pin or anchor pins engage properly.
10. Direct clutch may be damaged or may have stuck ball check in piston.
11. Forward clutch does not release.
12. Low-reverse ball check missing from case.
13. Control valve body malfunctioning. Check for leaking, damaged or incorrectly installed gaskets, 2-3 shift valve stuck open, or restricted reverse feed passage.