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Re: What did you do to your Blazer/Jimmy today?
Quote:
Originally Posted by mister.freeze
I've got 33's, 4L60, and 3.73 diffs... this one is carried over from when I had a TH350 and 31's. Wonder what I need now.
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With the speedo cable directly attached to the t-case record the displayed speed at 20, 40, and 60 MPH using a GPS receiver. Divide the known GPS speed by that shown on the speedometer to get the ratio you need to step up (or step down) the cable speed, i.e. 60/50 = 1.2.
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1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308
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