Need some tranny help and some parts help

[GMC1965]

Hey everyone, placed an order few days ago for all my panels,lens, mirrors, and all new brakes. Not to bad pricing either. I used classic parts . Com. Anyways, My trannsmittion runs and shifts good but it leaks. The truck is a 65 c10 GMC 283 4 on floor. The tranny has a half inch of oil on it. Any ideas? I also needed help on parts I needed 2 I think. The heater panel (deluxe heater) Inside cab(three levered panel to the right of the radio). It has no levers? How do I remove it to look under there for some broken knobs? I am also having a hard time looking for GMC c10 logos above the L/R rear fender.

Thanks in advance!

Heres some pictures!