89 and up was 28 spline. 88 down was 26 spline
edit: for the 10 bolts that is. Just be careful if your dealing with 89's cause "supposedly" there are some 26 splines mixed in. I think.
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
Last edited by deadtrend1; 11-20-2009 at 04:16 PM.
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