Cruising around 35mph....ratchet back to 2nd gear and punch it....let off the gas just as you ratchet back into 3rd and when the tranny hits third there is a squeek...rubber sounding....like the end of a burn out at the drags strip when the tires grab and you hear that screech/squeek?

If I just keep on the throttle, not even that hard, it doesnt happen. Oh, also happens 1st to 2nd.

Not to fresh on the ins/outs of the TH400....any ideas?