I know most of you run slushboxes for consistency, but what do the guys with a a "man pedal" use for gear oil? I have yet to fill my Muncie yet, looking for advice.

Most recommend 80-90 weight. Do not use synthetics. Not good with the syncro

Any preference on brand?

GM Synchromesh Transmission Fluid Part # 12345349

I have run synthetic and non. I didn't have any problems with the syncros with the synthetic which surprises folks. I ran it that way for many years. Ed Hartnett just did my transmission this summer after roughly 6 years. It's a muncie supercase M21. The only issues were cluster gear and input bearing. Of course the expendables were replaced. That said I put non synthetic in it this time.

Scott

I found that Brad Penn sells gl-4, non synthetic. Picked up a few quarts last week.