Please help me, I recently installed a rebuilt auto 4cycl tranny and my car wont reverse or drive, it won't move all, it just revs.. when the car is jacked up in front the tires spin in drive and in reverse but on the ground it doesn't move. Also when shifting the gears on the ground you can't hear anything or feel it. Any help will be greatly appreciated.

 

Maybe no clutch pressure? Oil pump gears too much clearance? I'm just throwing ideas out there.