Can a 91 dodge 1500 transmission interchange with 99 1500?
No, a 1991 Dodge 1500 transmission will almost certainly not interchange with a 1999 Dodge 1500 transmission. Dodge changed transmissions and their mounting points significantly between those model years. Even if the transmissions *appeared* similar externally, the bellhousing (which connects to the engine) and other mounting components would be different and incompatible. You'd run into major issues with the driveshaft, linkage, and the overall physical fitment.