i have a 98 Chev. 2500 4x4 with a 6.5 td and 5spd manual. i was thinking bout changing to a 6 spd to try to get a little better highway mpg. or would an add on overdrive be better? also thinking about getting a reprogramed ecm. any suggestions?
i think it would be better in the 1/2 ton and suv models. if your buying hd truck it's probably for hauling, so i think you would want the bigger engine.
Hi. My son has been nagging me for a long time to get on here so here i am. I have 2 diesel trucks. One is a 98 Chevy 3/4ton 4X4 ext. cab with a 6.5 the other is a 82 GMC jimmy 4X4 with a 6.2.