No Reverse or Slips In Reverse

1. Forward clutch:
a. Burned clutch plates.
b. Seal ring off piston.
c. Exhaust check ball sticking.
2. Lo and reverse clutch:
a. Housing cup plug assembly restricted or not fully seated.
b. Leaking seals.
3. Low and reverse pipe O-ring seal damaged or missing.
4. Incorrect, damaged or leaking case to cover gasket.
5. Burned direct clutch plates.
6. Burned low and reverse clutch plates.
7. Low line pressure.