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Ratio Question ???

then you need to remove one of the diff covers and count the number of teeth on the ring gear and divide it by the number of teeth on the pinion gear. if both rear wheels spin in the same direction by hand while in the air it is limited slip if they spin in opposite directions then it isn't
 
'87 XJ. If it's a 4.0L, 5-speeds were 3.07 and automatics were 3.54.

If it's a 4-cyl, could be 4.10, 3.73, 3.54 or even 3.31.
 
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