The 80W-90W (Valvoline) multi viscosity oil that is sold at most parts stores should be perfect for the ZF. It has additives to exist with clutches BUT it doesn't have limited slip additives!
No reason to add an oil cooler to a Goose. No one gets to autobahn speeds over here!
I've driven to Phoenix and back and ZF stays nice and cool, about 180 at most, probably due to temp xfer from engine.
OVERFILLING GOOSE TRANS WILL CAUSE IT TO OVERHEAT!!! DO NOT USE THE SIDE HOLE AS A REFERENCE FOR FILLING!!!!!! (Don't listen to Pantera owners who don't know Jack Shitkowski! Their ZF's require different amount than the Goose!)
)))However, based upon MY experience, do not put the additives in.
I added some synthetic lube for clutches (because I do it for all my Ford rearends....) and due to a funky front seal, AND over filling it just a tad (ZF in Goose is touchy to level!)...I had fluid contaminate my expensive Kevlar (like) clutch linings and I didn't go so fast any longer.....! Was like driving an automatic transmission!!!! SLIIIIIPPPPPP!!!! This little slip up (HAH!) cost me an expensive clutch disc....and a tear down to install a new one! UGH!
I marked up an old engine oil dipstick accordingly to use to check ZF level.
It is important to keep oil level right at lower edge of mainshaft, where it exits trans at front seal. Over filling can lead to leaks when sitting......if the front seal is a bit dodgy!
More pic's to follow.
