Charles F Fisher wrote:
We have a 1987 Coachman 5th wheel. We pull it with a 77 C20 Chevy Camper Special It has a 454 from the factory the rear is a 3.21 ratio our problem is long steep hills. We hit the bottom doing 65 and by the top we are at maybe 30. Do I change the rear to 4/11 or build up the engine. The truck is like new been in storage a long time with no rust and the camper is in the same condition.
If the truck actually what you say it is.... “Like new” is generally a way over used term...
Then your best bang for the buck is to sell it, as a like new truck like that will fetch $15k or more. Then use that money to buy something that will tow, drive and ride far better.