Hezsus
Mr. Truck
do you have 3.42 or 3.73 gears? I think that It could be a gearing/tire problem as well, since your going the same speed as you would with stock tires but the engine is revving less, which causes the TC to lockup early. I think that either a gegear or a higher stall TC would fix this. Thats what i'm thinking my problem is anyways.