So, My grandson just bought his first truck. He has an 89 Dakota with a 3.9 and the auto overdrive trans. Reverse is out of the original trans, and I have a good auto overdrive trans out of a 91 Dakota with 3.9 under my bench, that's been there about a year.

Other then the trans cooler lines on the 91 being larger then the trans cooler lines on the 89, is there any other issues I might run into? If the trans cooler lines are the only issue, we will add the larger lines, and probably go with an aftermarket cooler hung in front of the rad.

So, what else is going to be an issue? Gene