Jeep transmission

I’ve been driving a “borrowed” '95 Jeep Grand Cherokee the past few months. It’s a 4 liter straight six with a 4 speed automatic tranny that came out of a boneyard to replace the original. I don’t know the history of this tranny. When coming to a stop, it won’t downshift into first if the selector is left in “drive”. It has to be shifted manually to get it to go down to first. It also shifts up through the gears too quickly, like it can’t wait to get to 3rd or 4th gear. For me, this is a way too young car, as I’m into '50s & '60s cars. So, I’m not too familiar with this transmission. I did change the filter and fluid, though, just to rule that out as a possible problem, but it made no difference. Any suggestions?

It sounds like the governor is sticking. Try a can of Berrymans B-12 Chemtool in the trans, it might clean it up a little bit. Usually though, they need to be replaced.