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Your rear end gear ratio has more to do with your top speed than your transmission.
On my Crown I switched the original 11.00X20 tires with 11X24.5 tires and picked up almost 5 MPH.
If you decide to switch transmissions, there are some Road Ranger transmissions that have overdrive gears. You will need to research which one would be the best choice for you but the swap is a pretty straight forward swap. Your Fuller 5-speed uses the same shift tower and linkage the Road Rangers use.
Whatever you decide to do, the installation of a pyrometer should be a priority. 2-cycle DD's like to run hard and hot. 4-cycle Cummins will melt pistons if you run them as hard and hot as a DD. I have seen the pyrometer go to 900 degrees on a flat highway when I was driving into a headwind. Same day driving back on the same highway the pyrometer was less than 400 degrees at the same speed.
Good luck and happy trails.
Mark O. |
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