Re: Rear vibration
I've had this issue before, the rear weight was lose and caused the u joint to wear out. I ended up throwing the drive shaft when I did a hard launch. I would grab that weight and see if it spins and for good measure replace the u joint.
2004 6.0 ccsb Warren 430/150 hybrids, Warren Comp Trans, Warren Dual Hpop, Billet S475 w/race cover, Marty's A1000 Fuel System, Colt Stage 2, and all the other supporting stuff
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