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LSD identification?



I'm about the swap the 3.25 LSD on my '87 535is for a 3.64 LSD from an 
E30.  How can I be sure that I in fact get a limited-slip differential 
(used) and how can I verify the drive ratio prior to installation?

Secondly, will I need to have my speedo recalibrated due to the ratio 
change or are the two even related?

Thanks for any help.

Scott
'87 535is