Rear Main Seal Conversion Kit for Flathead Ford V8 for late 1936, 1937, 1938, 1939, 1940, 1941, 1942.  This is for rear main caps that are machined for a pot metal labyrinth seal piece. Kit changes rear main seal from labyrinth seal, where nothing touches the crank, to a rope seal that bears on the dedicated seal surface of the crank.  It requires a later crankshaft, ground to fit, or grinding the rear slinger off of the present crankshaft thus creating a rope seal surface of 2.498" concentric with the main journals.  Kit includes instructions, upper and lower seal retainers, and the rear seal kit. The seal retainers may be new or used.

If your rear main cap does not have a machined surface for a lower labyrinth seal you may need the 1932-early '36 kit product code #1180.