I swapped out my old crummy transmission and bought a nice redone 700r4 transmission. I connected all the cables and even had a transmission shop take a look at it to see that the problem was. as far as i know were the speedometer cable connects at the tail isn't processing the way it should? any suggestions to diagnose the problem?

If the transmission does not read how fast it is going effect the shifting? will it screw it up?

Any suggestions would be appreciated

 

It the drive gear tabbed to the correct hole? There are 2.