On my 46 with a 54 fresh 235 I mashed the tranny/ diff ratio numbers apps ad infinitum on which gear ratio to install, falling between the 390 and 411. I’m a glad I went with the 4.11.
Why? My PO had a 3.00 in the truck and I could never use the t5 5th gear, having run that setup informed me of the optimum final drive I wanted but mostly what I learned was besides freeway driving was that 1st and reverse were way tall, especially reverse.
With the 4:11 1st and reverse are in a sweet spot and the clutch takes notably less use on starts, it feels like a truck gearing should instead of a car. 1st is good to get you rolling easily but it is nowhere near a granny gear low, if you are not completely stopped 2nd will pull fine.
As for top speed I can now use 5th on the freeways and 65 is easily doable (I’m typ a 60mph guy at most) and I do not feel I have enough torque to really push anything taller.
Chuck
