I have 50,000 miles on my 2019 Ram 1500 and I thought it would be due for a transmission service so I called the local dealer and he said it never needs changing. I thought I read someplace that it's a good idea to replace it at 50,000 miles I don't remember where I read that.
FCA states that all the ZF transmissions have "lifetime" fluid. ZF states that not changing fluid until 100,000 miles produces "acceptable rates of failure."
Now, FCA will be free of warranty obligations by then (100,000 miles). And, ZF may deem "acceptable" to be a failure rate greater than 0%. Me? If my transmission lets me down...ever...that is unacceptable.
Most folks will say a change at 50,000 miles would be about right. (Sooner, if you use it heavily: towing, loading up the bed, snow plow, extreme temps (desert), etc.)
The ZF transmission fluid change is pretty simple: drop the pan (all the ZF 8HP's use the same pan), (it has a filter built in): put the new one in (new gasket and bolts included), add the right fluid (liqui moly, amsoil, redline or whatnot: you don't need to use mopar or ZF). Bob's your uncle.
xposted with
@Mjgain : he and I are advising the same thing...