I've seen the mileage my truck can get when I go the speed limit of it's era (55) and I like it. The problem is all the freeway driving I do anymore is at least 70, sometimes more. Does Marlin sell a taller 5th gear or does anyone know of where I could get one? All the other ratios are fine, but when I do the 4th-5th shift, RPMs barely drop. The truck has plenty of grunt to maintain speed, I just need to get the RPMs down another 250-500 RPM.

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
--------------------
"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson