940 rebuild... should I?

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.

Might just need a part throttle kickdown kit, as it solved that problem with my old 904.
After installing that it would kick down with just about 2/3 throttle. (doing 45 and stand on it)

I think by the time I had it apart I realized how easy it would be to put it back and was scratching my head. Now mind you I was smart enough not to pull that sprag out of the bottom of that case. That may give you a little challenge. But definitely nothing insurmountable I'm positive.

If a guy couldn't put that sprag springs and rollers back in 2 min or less he wouldn't,,,, well you know. :D

One of the ends of the springs against the metal stops makes the spring curve away from the sprag center hub and the other end doesn't. (and is wrong):D