The 83-86 cars have 3.45's in a 7.5" drum axle regardless of tranny. The 87-88's have 3.55's for 5-spds and 3.73's for autos in an 8.8" disc setup. I have an 87 3.73 disc rear in my car now, its a little quicker but didn't ruin it on the highway. I'm at 2900 rpm's at 65 mph but it definitely lowered my top speed.
[This message has been edited by fastguy (edited 09-03-2000).]
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