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I have a 51 F1 which of course is also a side shift.
I was advised that the overdrive trans was very hard to get mounted into an F1 so I got a rear end out of a ‘72 F100 that is about 3.5:1.
That makes the old V8 geared perfectly unless I stop on a steel hill with a load like a car on a tow bar or on a trailer.
I often run along the freeway at 65 to 70 MPH.