Ford 4F27E (FN4A-EL) & FNR5 (FS5A-EL) Transaxles
To release the Intermediate/Overdrive Band for the 2-3 shift on Ford's 4F27E, Direct Clutch oil is applied to the top of the servo piston. The Direct clutch oil, with the aid of the servo return spring, overcomes apply oil, forcing the servo downward and releasing the band. The problem is that as the servo applies and releases, the pin wears the case. This wear in the case creates a gap through which Direct clutch oil leaks, causing a lack of apply pressure to the clutch and release pressure on the servo. With this loss of pressure, the life of both the Direct clutch and the Band, even after a rebuild, is seriously shortened.
The 4F27 kit contains all tooling necessary to repair both the 2-4 servo pin bore. It is a BLUE series kit, and is available as either a Master (pictured) or Sub kit.