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  1. erasedhammer

    4l80 engine speed at 60

    I mean the differential not the transfer case. 2.56, 2.73, or 3.08
  2. erasedhammer

    4l80 engine speed at 60

    Whats your diff ratio? 2.73 or 2.56?
  3. erasedhammer

    4l80 engine speed at 60

    Transfer case doesn't matter in this case. It's 1:1 in high so I can ignore it. I have a 4l80 so it's a 0.75 overdrive but also has a locking torque converter that is 1:1 but offers Ron reduction as well.
  4. erasedhammer

    4l80 engine speed at 60

    1.92 is the geared hub ratio, I just multiplied that by the diff ratio and put that in as the diff ratio in the calculator.
  5. erasedhammer

    4l80 engine speed at 60

    Did some math, or I should restate, a website did some math. I went to a couple different engine rpm calculators to see what rpm my engine would be doing at a certain speed with certain ratios. All the ones with plenty of input data were consistent, so heres the one I used...
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