Hey Duane, Cody will give you good info hear but just to let you know I've been pulling my gn 3-horse trl in the 80dd tune. It's wt is about 6500lbs empty & with 3 1000lb horses my temps have stayed good. I pretty much drive like a old fart with horses on & like the shifts better than the 65t. Haven't been in the hills so don't know what the temps will go to but I'll just keep eye on guages. Check out the 120perf tune, it's lots of fun for playing & the high idle is great for the A/C. Good luck, CJ
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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