You doing them in your 86 or 98 Z? is the car originally a 2 or 3 carrier?
If it is your 98Z and if it's an A-4 your car came with 2:73's unless it is a 6-speed and it came with 3:42 , if it is a 2:73 you'll need a motive ring spacer to make the jump up to a 3 carrier
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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