D6 is the low viscosity ATF, equivalent to the Amsoil Blue Cap ATF. D4 is the regular multi vehicle stuff, equivalent to the Amsoil Red Cap ATF. Amsoil calls for blue cap in our trans and red cap in the transfer case. So we can deduce that RL D6 is for the trans and D4 for the transfer case.Would there be any problem with the redline D6 ATF fluid in the t case
Or is the D4 closer to spec ? Any amsoil fluid close to spec to use ? Also the transmission fluid any recommended amsoil or redline ATF ?
Can the gurus chime in.






