What transmission should I use?

[studebakerman2001]

I have a 1983 k3500 with the 6.2l. I currently have the SM465 and 4.11 gears in the axles. I would like to put in an overdrive transmission, for better milage and a lower cruising rpm. The NV4500 is a little more than I want to spend. I heard that New Process made a 4 speed with 4th gear being overdrive that was put in chevy trucks at some point. Does anyone know what transmission it is or if its any good?

[NH2112]

It's the New Process A833 (or maybe A883.) It's a pretty light duty transmission, I wouldn't use it in a 1-ton unless you never haul or tow. I think the least expensive way to see some improvements is to fit a set of taller tires to effectively raise the gearing. Try not to go wider than what you have now, though, because that means more friction.