Okay so i was cleaning out my garage and found 5 quarts of royal purple Max Gear.(was for my old chevy) I was curious do you think this would be good for my tranny. It is 85w140, says great for manual transmissions requiring GL-4 or GL-5 fluids on the side, It is fully synthetic. Works with lsds too.

 

That gear oil is to thick. I would recommend using royal purple max gear 75w90 in the summer and royal purple synchromax in the winter.