I have to agree with everyone else, it's your Tq locking and un locking.
1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote
List of things to do
4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
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