Do you have pictures of the brackets to illustrate your points and descriptions?

The year differences in the gear boxes may be standard and then metric fittings?? At least the IH box I used changed from standard to metric about the same time, otherwise the same.

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-