How many splines did the 1991 rs 305 tbi come with in the rear end? It is a 2.73 open diff
that I want to upgrade to the slp posi unit on special for $74. When I tried to ordr it they said I need to make sure I have 28 splines not 26. Did my car come factory with 28 or will I have to open it up and count them? any help would be appreciated. I plan on replacing my 2.73's with 3.23's

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91' red RS convert.
71,000 miles
89' IROC hood
red Z-28 16" rims
potenza re730's
MSD ignition
MSD coil
K&N fiter
350 ported polished heads
hypertech chip
flowmaster 40 series cat-back

 

Should be 28 spline

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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro