What's wrong with my transmission?

What is your question?

Hello My cars transmission had a crack and fluid leaked out and the clutches were bad. So I got a transmission from the wrecking yard, same year and everything. So I had this transmission new clutches rebuilt from a guy in his garage for a low price. so we installed the transmission and it takes a while to change gears, the car won't go over 50 mph up hill, but it does fine and goes well over 75 mph on a flat road. Did the guy who rebuilt the transmission not adjust something right or not put in something right? also its a FWD auto, is a P R N D 2 1 a 3 speed or 4 speed? My car has 107000 miles. My car has an automatic transmission.

What makes this problem better or worse?

driving uphill

How long has your 1997 Plymouth Grand Voyager had this problem?

months