Hello, My new 4.10 gears and limited slips are in. WOW..., what a difference from 3.07s...! Anyway, I have a 350/350 drivetrain combo and am running 33 inch tires. At 60mph I am pushing 3,000rpms. This is not optimal as I use the Jimmy as a daily driver and tow rig for long trips. What is most realistic option to getting an overdrive system for my rig when considering installation and cost...? Thanks!