That’s interesting @zmetzing. I know there is another overdrive I can put on my 4r100 but its not worth it to me. The builder of it doesn’t advise towing heavy loads using that gear.
So I thought I’d update. Transmission is working great. I saw an increase in my mileage. I went from about 13.3 to 16.6 mpg, that ain’t babying it either. That is about 25% & some more room for improvement. I have a boost leak on the discharge valute to spyder that I have to contend with.