Got the duster out !!! But.....

Ran my old car after 6 years , bought it back from a friend of mine..he didnt really took care of the car beside regular maintenance , somebody palyed with the kickdown linkage a couple years ago and with the march 1 pulleys and never came back to finish the job ....belts.are squeeking really hard and the trans doesnt feel right in 2nd and 3rd is great...car sems hesitating to shift in 2nd when leaving a light or a stop sign...2800 stall , 727 , shift kit and oil cooler....can it be the kickdown ? Bands ? Or torque slipping away ? Im not a transmission guy and when i sold him the car 6 years ago it was running A1 , has a 380hp crate and 3.91s