Transmission additive for hard shifting full#
For one thing, its labelling leads me to believe that its not a true full synthetic oil like their engine oil is. But I don't think its particularly great. I've used Mobil 1 synthetic in the past, and its a good fluid. I plan to use this in the 904 on my Duster when I go pick it up. The transmission in my truck (Toyota, which obviously is built differently than a Torqueflite) used to get pretty friggen hot on long drives (so hot the metal shifter would feel hot to the touch just by the heat being conducted through the linkage, though it never tripped the overheat light) but after a couple changes with synthetic to completely flush out the old fluid, the shifter hardly feels warm at all on long drives. I've used all Mobil 1 synthetic lubricants in my vehicles and I love them. Just to throw another monkey wrench in here I use Mobil 1 synthetic AFT which is spec'd for the latest Dexron applications, so I would expect it would also work well in a Torqueflite. The latest Chrysler Mopar ATF+4 is better than the current Dexron in terms of virtually all the important performance characteristics, but ATF+4 is expensive. Off-the-shelf Dexron is your easiest, least costly choice, and it is a safe one. It is common to hear or read that harder shifts are better for the life of the transmission, but that's not necessarily so it's an oversimplification. There are less abusive ways of hardening the shifts if that is something you regard as desireable. The Torqueflite is well enough engineered and built to be resistant to abuse, but I don't see any point in deliberately using an inferior fluid. Others, as you have seen in this thread, use Type-F because for one reason or another they prefer harder shifts.
It's a friction-unmodified fluid, which attracts drag racers to it because it causes harder shifts.
Compared to Dexron, Mercon or Chrysler ATF+4, the Type-F has very poor lubricity, very poor resistance to oxidation, very poor extreme-pressure properties, very poor viscosity stability at cold and hot temperatures, very poor detergent action. Type-F was a Ford fluid of the late 60s through mid '70s, used in combination with specific clutch materials Ford was using in their transmissions at the time. Type-A/Suffix-A was replaced by Dexron throughout the auto industry in the late 1960s, and Dexron has been evolving ever since.
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