940 rebuild... should I?

Ok, so I've seen posts here that have said a 940 is one of the easiest transmissions to rebuild. Not sure how 'easy' it really is. I'm fairly mechanically adept, have been able to do most things to my car with the exception of the transmission and rear end work. My 71 Dart 340 Swinger is my daily and the current 940 will shift up ok but won't kick down on throttle stomp and I basically have to stop for it to come back down to 1st or second. During normal acceleration, 1-2 is at 20ish, 2-3 is at 40ish.

This sounds to me like it’s got a TV (kick down) linkage problem. I’d go over my linkage to ensure it’s operating as it should. Could be binding or just simply not adjusted correctly. Why spend money when you could end up with it doing the same thing after rebuild due to another issue.