How can I tell if the reverse band is broke or the servo is broken?

 

I'm guessing you don't have reverse? Funny, me neither....

Get FSM from https://dodgeforum.com/forum/2nd-gen...e-manuals.html.

Don't remember which page it's on, but look up the procedure for rear band adjustment.

Take off tranny pan, look for anything floating around that shouldn't be.

Do the procedure, re-fill with 6-7qts of ATF+4 ONLY, see if reverse acts any different....
Ah, new pan gasket and filter too.