CJ750 toolbox
Miin Leong on Redline MT-90 oil:

I`ve been using this oil on my Porsche 911 gearbox for years and decided to try it on the CJ. It's made by Redline and is a GL-4. I've been testing it on six CJ bikes for 10 months. We found it improves the shifting better than the Moly Slip I used to recommend. IMO, it's great for CJ gearboxes & final drives. I always fill to 90-95% of what the factory recommends with a measuring cup, or fill to the bottom edge of the filler hole threads. Do not overfill. You can buy this at most local performance auto parts store in North America.