I'm going to be draining and refilling my transfer case fluid and wondering what kind of fluid I should use for a 2000 dodge ram 2500? I don't have the manual for my truck and couldn't find anything with search.
I my 2001 owner's manual says to use ATF+4, Type 9602.
The manual does not specify or list different transfer cases either, which is odd. It just says to use the ATF+4.
I remembered one time one my 93 Dakota 4x4, with the NP231 tcase, it called for ATF+3, Type 7176. I normally used Amsoil ATF and one time used Mobil 1 and the tcase would not stay in 4HI or even shift into 4LO. I drained that crap out and refilled it with Amsoil ATF, and it worked flawlessly.
Basically, use what the manual says. It you go synthetic, make sure that the synthetic ATF you are using is compatible with what 'normal' fluid is recommended.
Unless your vehicle uses a limited slip, I don't think it will matter too much.
I would be concerned about mixing two different types of fluids into a tranny like the Dexron/Mercon and the Chrysler ATF3. They can gell and do other things since they don't mix. But if you drain and get rid of most of the fluid, there shouldn't be a problem with a t-case that doesn't really need much as far as lubricating other than just having some sort of liquid in there.