Originally Posted by mrclean
I have towed our pop up with a 3.5" lift and 31's with 3:55 gears and did not have a problem. I would try to stick with 3rd, but "feel it out" and if your driving is flat and you won't encounter too many hills, you may be able to get away with overdrive as long as it doesn't shift in/out off overdrive too often.
exactly what he said. Biggest problem I found was finding the proper drop to make the trailer sit level.