I'm having a serious problem with my tranny.  originally it started to shudder from first to second then the next day i lost forward movent all together but had perfect reverse.  I had another 4hp 24 tranny in my parts car so i swapped them but used the old oil pump because i had to drill a bolt out of the bellhousing. didnt want to take any risks but the pump is fine just has a nick in the housing.  anyways i put the tranny in and only had movent for a few moments after starting the car then nothing. then i realized the parts car had a 7 pin plug for the valve body so i switched valve bodies and harnesses and now have near zero movement.  It will go into reverse but not fully, it slips more than anything.  Since i changed valve bodies the dash no longer says trans program though.  Oh and also when the old tranny stopped going forward the dash said trans program.

Could it be the oil pump?? if so why was the old tranny able to go into reverse perfectly. If you could help it would be greatly appreciated. I've been working on the car all day every day for two weeks straight.

Thanks, Kevin