904 Slippage

I just took my Demon to the local AAMCO for an "in car reseal" on the 904 torqueflite. They did a great job sealing everything, took care of a few dings in the pan, installed my new speedo cable, and all is dry as a bone now.

Problem is that it shifted perfectly when I took it in, and now it slips when it goes from second to third........first to second is solid as a bear, but into third and it races for a split second and engages.

Could this be a simple band adjustment or something? Seems funny that it worked fine when it went in (I know, you've all heard that before....but it's accurate).

Give me a pointer here........I'd hate to schedule a rebuild if I don't need it. Something seems a bit screwy.

Thanks for the tips........... Doc