transmission help
#11
What your really talking about here are the viscosity improvers and friction modifiers that are used in the base stock to create the finished transmission fluid. The ATF+4 spec calls out a very specific viscosity improver that Chrysler found would remain shear-stable for 100,000 miles (because people don't perform fluid/filter changes like they should). Dexron III starts to lose viscosity around 25,000 miles. Not a problem if you change your fluid and adjust your bands once per year. In real world terms the Dexron fluid that you put in is a little slicker (not as much grab) than the ATF+4 and is made from refined crude oil and it will lose viscosity quicker and won't tolerate as much heat (towing, hauling) as ATF +4. The problem that you describe in your first post is related to the govenor (sets and holds line pressure) in the transmission. The RH transmission used a hydraulic governor. Transmission has test ports on the side of the case to verify line pressure. I don't have them off the top of my head but if you have access to alldata or a factory manual they will be printed. That is the only way to accurately diagnosis the problem.
#12
#14