Re: 1954 Packard rear end differential

Posted by packardbill On 2024/5/20 19:40:17

Many moons ago we used 90w pure mineral gear oil, in diffs, which is what it was designed for. You should be fine with 85/140, like was said above, or a RedLine "heavy" lube. Just a note of caution, the modern EP (extreme pressure) additives, over time, will degrade brass or bronze, so be wary of bushings
or maybe side gear spacers etc. in application. pb