Two weeks ago my truck was very sluggish in 1st, if I manually down shifted to 1st then up it was fine. This week I changed the tranny filter and fluid, now it will start out great in drive until I get out of 2nd, then tranny acts like I threw it down into 1st and back tires start skidding. When I changed the fluid, the color and level were good, didn't smell burnt and there were no pieces of metal in the fluid.

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....adjusted the rear/low band while i was at it, could it be to tight?