a4ld v6 automatic 3.0

I swapped the transmission and the thing will not shift. Even when manually shift from 1st to 2nd with no change in rpm or speed. Things I have checked Vacuum, fluid,and electrical connections. What could be the problem. I want to drive her, but I don't want to burn up a new tranny. Please help

I have a 91 ranger with a 3.0 V6. The AUTOMATIC transmission went out. I bought a donor truck. A 92 with a 3.0 Everything was going great until I had trouble getting the top two bolts out to remove the transmission. Since this was a parts truck I just cut the floorpans to get to them. Got the...