Transmission and rears lube.

[Waterloo]

(03-17-2016 )NewSon Wrote:  Hey folks!
Please give me an advice!
Prostar Cummins 2010 Eaton fuller 10spd Trans and rears.
It's time to change my oils in transmission and differentials, and I wonder which one to pour in.
Most people say shaffers 50w for Trans and 75w for rears are really good. What are your advices guys?

Honestly, I would use what International recommends, and I know that is a synthetic... Just drop the fluid every 200,000 miles and you should be good. That is what I do, and have never had any issues, and that is the bottom line, NO ISSUES. It's not a race car...

Just my .02