I have 28,000 pounds in front of 300hp/950tq and on 6% grades I tend to stabilize at 48mph. I would think at 42,000 pounds it would be much slower... 3rd gear for sure and maybe even down to 2nd.
Steve
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The Green Machine -- 2000 Mountain High Coachworks Summit (Spartan chassis / Cummins ISC)
...and F-Troop: Fearghus, Fiona, and Frankie (Cairn Terriers)
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