it depends on how you measure and if you have positive and negative numbers, but your method of subtraction is correct. i usually zero my digital on the ds and then there is no adding or subtracting needed. i just have to rezero every time an adjustment is made, but its a 2 second process.
what was 0*? i ask because if your trans was pointed down in the back, and your driveshaft was climbing up towards the pinion, then you have a 6.6* WA.
Tim
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