Littleboyblu...if you are describing a “flare” during the 1-2 shift (engine RPM starts to run up a bit during the shift then settles back down as 2nd gear catches) then there is a chance a simple band adjustment will cure it——there is also a chance it won’t and the tranny needs a rebuild.
Adjusting the bands is a two part thing..the front band adjustment is external and easily done. The other requires a pan drop.

Adjust the front band. Adjust the rear when you drop the pan, these steps are important.