E4OD, 4R100 Extension Housing

The E4OD and the 4R100 are fitted with different extension housing depending on year and application.

Here are the options for the 2 wheel drive (2Wd) extension housing:
1989 - 1991.
1992 - 1997 with casting numbers F2 through F6.
1992 - Up E4OD with 3 1/8" rear seal and no sensor hole.
1992 - Up E4OD with 3 1/8" rear seal with senor hole.
1992 - Up E4OD with 2 1/2" rear seal with no sensor hole.
1998 - Up 4R100 with 1.890 bushing.

4Wd extension housing:
1989 - 1991
1992 - Up E4OD
1998-Up 4R100