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Thanks for the great ideas! I will add them to my list of possible solutions. I’m hoping to not have to go far down the list for a solution. The guys I have looking at it just did a job for FEMA changing out pumpkins on new trucks somebody ordered that would only run 45, so I’m hoping they find...

Right now I’m first looking at replacing axle gears to improve speed, possibly even planetaries. Initial estimate for putting in a 4700 rds transmission is about $50k. That’s a pretty steep hit for a little speed.

These are great ideas. Have you done or known someone who's done one of these conversions? I guess the mating of a new trans. isn't an issue since the 92 engine is very common. The Cat 7155 probably would be cheapest, but I have a 916 and all that air clanging and banging while shifting drives...

Has anyone with a HET undertaken modifications to get the speed up? Replacing four pumpkins can't be fun, but just curious about any mods. My 55 mph trucks I want to run 65, but I'd be happy getting the HET just up to 55.