[Accelo]

Gear ratios displayed below for the two transmissions.

M465 transmission- 6.54, 3.57, 1.57, 1.00
M4500-transmission 5.61, 3.04, 1.67, 1.00, 0.73

Turbo 350 transmission 2.52, 1.52, 1:00

Easy to see that the truck transmission are a lot lower ratios than the 350 automatic.
Both the truck manuals are designed to start in 2ond gear. First is really low for pulling.
The real advantage to the NV4500 is the O.D which drops the rpm by one third.
You will not believe how much it lowers the noise in the cab when in overdrive.
Gas mileage can increase by as much as 30%.
Good look what ever you choice/budget dictates.