I just finished servicing my truck for a 10k mile trip. The truck has 154k on it and i want it to last.
Amsoil in both diff's, Mopar fluid in 5 speed and Pennsoil ATF in x-fer case. The service manager at our Dodge shop, who is also an Amsoil dealer, told me that any good grade of ATF in the x-fer case is fine.
I use Shell Rotella synthetic in the engine. Buy it at Walmart.
2012 Jayco 40FER Bungalow TT
2004.5 Dodge 3500 DRW 4x4 Quadcab CTD 325/600 6 spd 3.73 HiJacker Hitch;Access bed cover; Prodigy; PacBrake; DZ boards;air horns;Westach combo gauge;Sirius;Smarty Jr, Lite Force road lites
Yamaha iSEB 3000 genset
Start Out Each Day Real Easy.......Then Taper Off