Will the 3.55 differential give you a workable, usable 1st gear with the SM420 granny low? In other words, does the SM 420 become a true 4-speed for practical normal driving? It is a pretty $$$erious modification to make if it carries no real benefit.
When I finally finish my '53 truck I want to be able to drive it somewhat normally (if sparingly) and not have to be afraid of Interstates.
Last edited by stoveboltgator; 05/19/2019 6:23 PM.
