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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.


A few observations that I have seen on my truck is that I got better MPG when I ran 33s with 5.29 gears than I do now with the same size tires and 4.88s. Higher RPMs worked out to higher MPG in my case. I do find the truck more driveable at the lower RPMs, less noise and vibration make long drives much more tolerable. I also find that on my truck, at 55, I get better MPG that I do at faster speeds. Air resistance is likely the main factor there.

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
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