Ford has revised the 4F27E and turned it into a five speed.  The five speed version has an identical servo bore, but the case web is closer to the area where the cover sits.  New 4F27 jigs will fit the FNR5.  If you purchased your jig before June of 2009, your jig can be modified to fit the FNR5 without returning it.  Please see the link below for printable instructions for modifying your jig.  Thank you.

SF-99 Servo Pin Bore Repair System

4F27

For use with 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 tooling necessary to repair the 2-4 servo pin bore.  The 4F27 is a BLUE series kit, and is available as either a Master (pictured) or a Sub kit..

Instructions:

(Requires Acrobat Reader)

Northland Transmission
105 East Poplar Avenue - Cameron, WI 54822
Phone: 715-458-2617 - Fax: 715-458-2611 - EMail: natstran@chibardun.net