Crazy part is I had the same thing happen to me with a set of motive gears for my 10 bolt about 5yrs ago. Had my buddies shop do the install. Sounded good for about a week and then it sounded like yours. They said that the solid pinion spacers are no good because they don't hold pre load and can back off. Not sure if its true or not.
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2000 SS Th350, FTI 4200 stall , cam, full bolt-ons, 150 wetshot, Moser 9inch/locker/4.11s, Slowhawk tuned. 493rwhp 570rwtq. 10.97 @ 127.7 1.58 60' and M6
10.84 @ 126.3 1.55 60' Th350 SOLD BUT NOT FORGOTTEN
New Toy - 06 Torrid Red Gto M6. 231/242 cam, Kooks, magnaflow, GForce, Monster stg2, lingenfelter cai, 411rwhp 385rwtq. 12.40@111
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