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Re: 3.73 diff specs? (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by RonW on January 29, 2001 at 14:04:50:

In Reply to: 3.73 diff specs? posted by Steve on January 29, 2001 at 12:54:22:

That depends where the speed signal comes from. The sensor is on the differential. If the speedo signal comes from an output shaft, or some point after the ring gear, then the diff ratio has no effect on the speed signal, and no recalibration is necessary.

If the signal comes from the input shaft, the speedo will be optimistic by 100*3.73/3.25-100=14.8%, so you would want to decrease its reading by 12.9%, i.e. it should be 87.1% of its old value.

I have an 88is & just swapped diffs to the 3.73 Yeeha! I was wondering what is has done to my speedo? Any info would help. Thanks in advance !

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