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e31 Differential Compatability, Continued... (archive)
[ Follow Ups ] [ 8-series (E31) Message Board ] [ Msg. Board FAQ ]
Posted by Greg K on March 23, 2000 at 11:57:46:

In Reply to: Re: E38 rear axle use on E31 posted by Sam on March 23, 2000 at 01:47:15:

All e31's, automatic and manual, appear to share a common differential casing. As noted, covers and input shafts may vary, but can easily be changed.

Regarding the e31 automatic's, the following ratios are in BMW's Parts System as factory standard:

840i 4spd auto: 2.93
840ci 5spd auto: 2.81
850i 4spd auto: 3.64
850ci 5spd auto: 2.81

The early e32 750 used a 3.15 and later (7/90) a 3.64 ratio, without manual transmissions offered.

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