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Bad vibrations
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Posted by: Paul Fletcher

Did an AOD to T5 swap but do you need a different harmonic balancer for each set up? This has been suggested but is this true? Have a killer vibe at about 3500 rpm, and had my driveshaft retubed and balanced.

Posted by: Mustang5L5

Nope, both balancers are the same. You used a 50 oz flywheel correct?

If it's not the driveshaft, it's gotta be the trans. Most vibes are from a bad tailshaft bushing causing the yoke to wobble

Posted by: Aussie XAXB

Agreed with Mustang5L5, and also I imagine you used new U-joints when reassembling?

Steve

Posted by: badass98svt

Yes, how about the U joints?
Everything is tight, right?

Posted by: Matt Rise

Check to make sure the driveshaft to pinion flange bolts are tight. You should always use some kind of loctite on them, either blue or red. Personally we use red. Seen it happen many times when someone takes out the D/S, then reinstalls it and the bolts fall out....not good.