I can only find 3.5 and 3.89 as options (3.89 would make cruise RPM even higher) for the 1960.
Switching to a auto or a 4 speed (unless final drive is less than 1:1) won't help cruise RPM.
A five speed eith a .67 or .7 OD would make a nice difference - about 500 RPM.
I have a T19 in my F250 and 4.88 gears, I can't do 50 with the stock configuration. I added a GearVendors overdrive and that speed is now attainable. There are tons of apps - that could be another route! | 
