No rotation from 4L60E

[barno68]

Just when I think the car is just about done, another issue... I was warming up the engine testing for leaks and decided to put the car in get since I had the wheels off anyway. Shifted it in to reverse and drive with no change in the engine pitch or rpm.

Tonight I tried it again and experienced the same result with no rotation at the rear axle. I also checked the fluid level before starting the engine and again after- no change in level.

I am leaning toward a bad pump, but wanted to see if anyone had some suggestion on what else to check before having to pull the trany. The 4L60E, LT1 and computer are all from the same vehicle. Could there be any computer setting that would cause pump issues?