HELP! th400

[Goffer]

passed emissions... new problem.

if I accelerate at an easy rate, like city driving, the truck won't **** until it hits about 3,200 rpm, as if I had it wide open.... when i punched it before the problem that is when it would shift into second followed by third at the same rpm. so that means when I leave a stop light the shift to second is hard and won't happen until around 3,200 rpm (with a chirp of the tires) and when I hit 45-50 mph (speed limit) I'm running around 3 grand in second. if I go up to 55 to get it to shift and then back it down to 45-50 mph it'll stay in third. fluid is full.

HELP ME PLEASE!