I did my own gear install and you should be able to wiggle the driveshaft A BIT, maybe not an 8th of a turn though. If your gears were going, you'd know it from the absurd howling coming from the rear. To confirm, get up to highway speed and take your foot off the gas. A really bad gearset will howl and vibrate. If it's just vibration, I noticed you didnt list an aluminum driveshaft as 1 of your mods. I'm running 3.73's with the stock shaft and I think the car's gonna fly apart above 85, so try replacing that. I've had a balancer go before and you know it when it happens. The car SHAKES VIOLENTLY! You can see the think literally wobbling off the front of the engine, but it's easy to tell cause it will shake at idle.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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