The Stovebolt Site Forums The Shop Area Engine Shop What wieght of oil do I use for my differential?

Hey Bolters, I tried searching this topic already and reading my manual with no avail. This question is concerning a 1955 1st series 1-ton.

I need to replace a leaky pinion oil seal and of course when I am done, I need to refill the diff with oil. My dad and I think 90w gear oil is what the trucks came with, but we want to be sure.

The manual I have goes through the procedure, but the only mention of oil is that it recommends soaking the new seal in motor oil for initial lubrication.

Thanks for your help bolters.

Here is a post from the search engine:
Hypoid Oil Thread

90w should be good thats what we put in our semis at the shop also i use royal purple in my personal truck and i love it i can feel the difference