Trans is getting stage 1 upgrade from Buschur. Any suggestions on fluid to use in the Trans and the transfer case?

 

each builder has their preferences go with what they recommend. When I spoke to Jon at TRE, he recommended either OEM or Redline. You cant go wrong with either, but places like Jacks Trans recommends only OEM, which I think is what Buschur recommends for theirs.

After having a lengthy talk with Jon, the only fluids I would use in my drivetrain are oem diaqueen or redline, fwiw.