I have a 1993 GMC 3500 that is in extremely nice shape. It has a 4.11 rear diff and a 5 speed standard transmission. I am giving it to my daughter's boyfriend and we plan to replace the 6.5 diesel wit...
Cheapest route would be to switch it over to a gas engine. They did hundreds of them back in the 80s to get rid of those 5.7 rattlers they used...$10,000 into a $8,000 truck isn't a good idea in my book.