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Mar 27, 2015 | 03:50 AM

86t/a383

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Teching In

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From: El Paso, Texas

Unknown vibration

02' WS6 M6 402 LS2 W/L92 heads Textralia clutch n Moser 12 bolt w/ 4.10s. Mid 90s Grand Sport wheels (GM, Not repops) 17x9.5 w275/40 front 17x11 w315/35 rear.

Substantial vibration 70-75mph in gear, 5th n 6th, light load. Feels like driveshaft. More throttle = less vibration and gone once passed 77 or so. Let off throttle n it gets worse till below 69~70. I neglected to check the conditions in 4th.

Driveshaft has been balanced. Rear tires have been replaced and balanced. Rear end was found with pinion play n leak n a poor pattern on ring gear. New ring n pinion installed. Vibration has gone unchanged.

Ideas?

Mar 27, 2015 | 09:34 AM

CO_BlackHawk

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From: Colorado

Bent Wheel?

Mar 27, 2015 | 12:06 PM

blackbyrd

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From: cookeville, TN

check pinion angle?

Mar 27, 2015 | 12:31 PM

97camaroguy

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From: Toronto

Check to see if you have a belt shift in your front tires. Look for bulging as well.

Mar 27, 2015 | 01:08 PM

Dutch7

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From: Elk Grove Cali

I would start with a tire rotation, wheel alignment, and wheel balance. Then if it persists you know it's something more serious

Mar 27, 2015 | 11:51 PM

86t/a383

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From: El Paso, Texas

Gonna double check ujoints n driveshaft balance. Then gonna rotate tires n do a roadforce balance on all four just to make sure there's no damage to the wheel. It definitely doesnt feel like a broken bead or flat spots but it's a cheap place to start. Pinion angle has been played with. It hooks better but no change to vibration.