How can I find out if my driveshaft is bent or bad? I have a high-speed vibration and its getting very annoying. All 4 tires have been balanced, everthing is tight inthe steering & no bad ball joints that I can detect.

Please advise,
thanks!

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1989 FIREBIRD FORMULA 350
K&N, ACCEL CAP & ROTOR,
FLOWMASTER AMERICAN THUNDER CAT-BACK

 

have it taken off by a tranny shop and have new u-joints put in it. while its getting new u-joints have em balance the shaft. it wont cost that much. more than likely its not bent, just out of balance. the u-joints could be a small part of the problem too.