I have a 88 crewcab 4x4 with a 454, 465,205. Well lets just say my milage really sucks, like around 5 miles a gallon. Granted it probably needs a good tune up and a few other little things done to bring it up a little, but even then if I'm lucky I'm only looking at 8-10. So I'm looking for some input, should I rebuild the current motor specifically for towing and mileage (yeah right..towing and mileage). Should I yank it all out and replace it itwith a 5.9 cummins and attached manual and transfer case ? /forums/images/graemlins/grin.gif Which my brother already has this configuration in his so it should be relatively easy to copy. Or just say the hell with it and buy a late model extended or crewcab with a diesel ?