Just like the topic says, are they 11.655 or smaller? Rear is from a 89 GTA, Also what gears does the rear have? It is an auto, 350 TPI with WS-6 suspention.

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1990 Camaro RS
1991 Acura Integra LS
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LT1 motor stuff so far:
TPIS ZZ-9 cam, Comp Cams 1.6 Roller Rockers, Comp Cams "R" Lifters, Crane Cams Dual Valvespring kit, Underdrive pulley, and an air foil.
383 LT1 Stroker project has begun.

 

11.655 is the correct Disc size for a 89
9-bolt the axle ratio could be 2:77, 3:27 or
3:45. You will have to check your RPO codes
for your car.