In Florida, your probably OK, but up here in northern IL where we can get cold weather in the winters, anything driven year around needs to run through the bottom of the radiator. Even with just the cooler in the bottom of the rad, the RE46 in my truck doesn't like to shift well until it runs enough to get the fluid temp up some when its cold like it was around Christmas this year. Once it got warmed up a bit, it worked great.
Same as the A833 with gear oil in: hard shifting until that oil gets heated a little in cold temps.
A lot of the NP833 sold in the colder climate states came with ATF in them, that helps a lot for shifting them no matter where you live or drive
Well aware of that. Chrysler made that change because of customer complaints.
ATF not the best for gear box longevity if transmitting heavy loads.
But chrysler wasn't concerned about longevity, only complaints.
If AFT is OK for gear boxes, why not place in rear axles also?
They're similar in design & usage.
