True, same thing but the "F" designates the foreward shift bar housing (top cover).
Both transmissions have the 3 overdrive ratios I listed earlier (all in the same transmission) and 0.62 is high gear.

If you find the one without the "F" then the cover and shift forks from a few different models may be able to be subtituted to make your trransmission an "F", if that's what you want...
You can find lots of roadranger literanture, manuals, and parts catalogs on the Roadranger web site. I printed out the manuals and parts catalogs for the different ones I have, very helpfull.
Grigg

•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-