I've flushed and run a transmission with diesel fuel, fill it up to normal level and remove driveshaft so no load while running it.
https://www.stovebolt.com/ubbthread...ve-improve-drive-repeat.html#Post1138446


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-