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Slippage in OD when hot but not when cold can be caused by:
Worn actuating piston seals. They seal well when the fluid is cold and thick but not so well as the hot thin fluid blows past..
Just plain low fluid. Gets picked up and sticks to stuff so not enough to get pumped.
Old fluid with worn out additives. Particularily the additive that minimizes foaming. Whip the fluid into a foam and air just does not compress like fluid.
OD/Tranny fluid debate. OD's on M41 or earlier tranny's use gear oil. M46 tranny/OD use Type F ATF. M46 trannies, staright 30 wt if temp never below 20 degrees F.
Oil additives. Not recommended in the OD added trannys. IF the additive is supposed to "cling" better or make things more slippery, you may have trouble not with the tranny but the OD. The OD has two systems that when at operating parameters, there is NO fluid between the mating parts. Any fluid or additive that interferes with this NO fluid parameter is worse when cold. Slippage during the wrong time can destroy the OD internally, or just hurt performance and fuel milage before wearing out the OD prematurly.
Duane
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