[Hellz]

possibly a starter issue?

when you hear the clunk, does the vehicle move as if the tranny and Tc were engaging the drive line?kinda like when shifting from park in to drive or reverse, you get that clunk in a way and feel it shift.

can you feel it at all when it clunks?

If it is more of a noise, i at a loss but i would think the starter when it engages the flywheel.

could it be just a coincidence after the fluid change... possibly.. double check the cans to very it is certified for the Tc....

guess one theory would be that the Tcase with the new fluid doesnt need to work hard as opposed to the old thick fluid that was in there.

i would hate the thought of recommending you to change the fluid... not sure how much all the fluid cost.. but i want to throw some royal purp in mine... and that aint cheap!