Originally Posted by
slammedEM1Si
I have a tranny and the Diff is shot to hell.
Are the open diffs from the Si (99-00)- the same as any LS, GS, GSR diffs?
thanks

It is the same as the LS as far as size and fitting the final drive gear pattern. It will not have the same pattern/fitment as the GSR from the 94+ models.