F4A41/42/51 2-3 Flare or Flare/Bump

There should be no more than .005" clearance between the side of the sealing ring and sealing ring groove.

Problem

The 2-3 shift has a flare or flare/bump before or after overhaul.

Possible Cause

One possible cause is excessive sealing ring to ring groove side clearance at the overdrive clutch sealing rings. The sealing rings can wear into the ring groove, and when the clearance between the side of the sealing ring and the ring groove exceeds .005" the sealing rings will leak.

Fix

Measure the clearance between the side of the sealing rings for the overdrive clutch and the ring groove with feeler gauges. The overdrive clutch sealing rings are the two smaller rings on the inside of the rear cover. If there is excessive clearance, the rear cover must be replaced.