I understand that depending on the year of your truck and type of transfer case, the operating fluid would be different.

Some use the ATF +4 9602 and others use good quality gear oil (i.e. 85w/140 valvoline /lucas/amsoil ect...).

As listed below, I have a 2001 2500 3/4 ton. I 'm not sure what transfer case is on my truck. Is the model number clearly displayed on the transfer case? What fluid goes in what transfer case? My owners manual is somewhat unclear.

Thanks!

 

I have a 2002 & it calls for ATF+4 in both the transmission (auto) & transfer case. ATF+4 is backwards compatible, I believe the requirement started in 2002. Does anyone know the difference in ATF+3 & +4? I use +3, not paying what the dealer wants for +4.

 

Recommended lubricant for the NV231 and NV241
transfer case is Mopart ATF +4, (MS 9602) Automatic
Transmission Fluid.

 

you should use atf for the t-case on the auto's, but is it the same with the manuals.

 

I put Amsoil ATF in my t-case almost a year ago....seems to shift a bit more smooth.
p.s. I'm not an Amsoil dealer or pusher, just found a good sale price on it one day

 

I just picked up a '90 wrangler and it calls for ATF. I looked back through the service manual and all the listed cases site ATF as the fill.

 

I also filled mine with Amsoil.