Time to change all the lubricants in my TJ. The front and rear differentials require 80W-90 gear oil which I have. The transmission requires 75W-90 gear oil which I cannot find locally. I assume the 75W-90 is a petroleum based oil (not synthetic) and is required for cold weather shifting. Anybody know who makes a 75W-90 gear oil.
You might want visit Summitracing.com for types of gear oil you can purchase. I recall there were manual transmission oil and gear oil available, again you might want check your owner's manual and ask the tech at Summit Racing.