A/T - C4/C5 Replacing Forward Drum Oil Rings
DATE: February 1, 1985SIL: 88-9 (Feb)
FORD C-4/C-5
SUBJECT: Forward Drum Oil Rings
When replacing forward oil control rings on the stator, check the ring fit in the bore of the drum, and ring side clearance in the land. If a 1/8" thick ring is removed and a 3/32" ring is installed a no-apply condition from reverse to forward could occur.
It's a good idea to check ring-to-land clearance in all transmissions. Don't rely on ring-to-bore fit when replacing oil control rings. Side clearance should be approximately .004 to .005.