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I can keep mine in 4th at 40MPH on a 3% grade at 900 degrees post turbo. I wasn't looking and caught it at 1000 deg in 3rd coming from Bjorn's to HWY 77 and let off right away. The real question is, what's the graph of pre vs post turbo temperatures? It's not so simple perhaps due to RPM, load...

With a turbo (or maybe without, I don' know) and a little fuel you can climb 2%-3% grades very well. You might be able to hold 40 in 4th on a 5% grade. Turning up the fuel more will fly you up that grade, but will the engine melt before you get to the top? That's the issue, you can only keep the...