When installing gears you need to check the pinion depth, backlash, and the tooth contact. If you don't your car will sound like a old school bus. In some cases a set of gears will whine even if there installed correct because of bad machine work. 
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79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor
93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe
Ricer hater's club member #49
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