545 Archives - Transmission Digest
Chrysler RFE 4C Retaining Ring and Shim Kit

The 4C return spring retaining ring in Chrysler 45/545/65/66/68RFE transmissions is known to come unseated and pop off, resulting in transmission failure. The Sonnax 4C retaining ring and shim kit (#72978-01K) solves this issue while offering more options when setting clutch clearance, and improving 4C to OD shift timing when more aggressive quicker applying OD