ok when iget my car up to about 65 mph it starts shaking really bad. i had my tires and wheels checked alignied and balanced,and my wheel bearings are fine. also i have a redundant growling from the back of the car? could my driveshaft be out of balance????

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods 400 performer rpm intake (polished) and 600 edlebrock carb, comp roller cam, and way better heads. orpossibly a 383 stroker?

 

Could be that, could be pinion bearings. Could also be axle bearings, or a bent axle from curbing the car (happens more often than most people like to think)

Is it at driveline speed or wheel speed?

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"So many Mustangs, so little time..."

 

hey thanks for the response!!! i really appreciate it. how can yout tell if it's the axle or eithier one of the bearing sets??? also i don't know what is driveline and wheel speed is help me please????

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 heads,350 horse cam,bored.40 over, Edlebrock torker2 intake.

Future mods 400 performer rpm intake (polished) and 600 edlebrock carb, comp roller cam, and way better heads. orpossibly a 383 stroker?