Best gear oil in 2.5 ton axle

[PilotMechanic]

This was a very interesting read. Here's a 1983 Rockwell Lubrication guide.

 

[Dunkeye11]

I got the traveler 5 gallon pail of 80W90 at tractor supply it’s what I used in my 151 about 1.5 gallons per diff I fill it till it pours out then wait a while until it drains good plug it The tool PS magazine tells you to make is good but I always thought that was the min level

I haven’t had any issues currently no leaks or overpressure check all your breathers to I replaced a bunch of mine