turdmagnet
Registered Member
I just got my transmission (muncie 465) rebuilt about 2 weeks ago and have put about 1100 miles on it in that time. It was initially filled with regular 80w-90 gear oil. Some dingbat at the shop put too much fluid in and now I am in the process of replacing the front seal.
Since I'm going to dump out the oil anyways, I am contemplating refilling it with synthetic oil in either 75w-90 or 75w-140 just to help it run cooler down south around Trinidad. Would any of you have reservations about using either of these synthetics in this transmission? 
Since I'm going to dump out the oil anyways, I am contemplating refilling it with synthetic oil in either 75w-90 or 75w-140 just to help it run cooler down south around Trinidad. Would any of you have reservations about using either of these synthetics in this transmission? 
