Thanks. Some info on the 2 tone I forgot to add. 1988 GMC Sierra 3500, 7.4L,THM-400 3-Speed, Dana 70HD diff 3.73. I need to decide on which direction to go with mods to the 400 trans. Don’t really tow much with the truck except moving my E26 Bobcat a couple times a year. Considering the Gear Vendors option for fuel economy (overdrive) or converting to a 4L80E. The 4L80E is my preference, but requires more mods/cost- controller, driveshaft, torque conv. The truck is used more as s daily cruiser.
