[GregWeld]

It took me quite a while to find Eaton's recommendations for gear lube. They have CHANGED their recommended lube policy from no synthetics since I last discussed this issue with Eaton reps at SEMA. Where they were absolutely telling us NO SYNTHETICS. The world is embracing synthetics... and we all run them in various fluid applications. However, I'll stand by my original statement because EATON used to tell people No Syn. That was probably 4 years ago now.

I think that even they are confused. The last time I went to Eaton's website (less than a year ago) they even had photos up and a couple of their differential photos showed a NO SYNTHETIC across the face of the photo!! Yet checking their website today tells you that they're okay in all their applications including lockers etc. but then my next post will show you their FAQ page which states a different policy!!! WTF

I'm posting this - because I'm NOT crazy.... and I like being factual rather than the guy that says "a guy told me that his buddy said".....












Detroit Truetrac®
High quality mineral or synthetic gear lubes are required for use in Detroit Truetrac differentials. Regardless of the lube type, always use a GL5 rated lube with the least amount of friction modifier. Mineral lubes lacking friction modifiers (limited-slip additives) were historically recommended for all Truetrac applications because friction modifiers can slightly reduce the bias ratio (limited-slip aggressiveness) of Truetrac differentials. However, to address the continually increasing power outputs of modern powertrains, many vehicle manufacturers have switched to synthetic lubricants as a counter measure for increased axle temperatures and prolonged service intervals. In general, consult the vehicle owner's manual for the manufacturer's recommendations for lubrication type, weight and fill volume. This will ensure lube compatibility with the seal materials and bearings used in the axle. Eaton Performance technical support is available for any concerns in lube selection.