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driveshaft angles are the angular differance between the pinion shaft,drive shaft and transmission mainshaft--the angle to the ground has nothing to do with it--
Now , having said that, if the only means you have fir measuring angles referances to the ground, you can correct the numbers to what the drive line is----
take the springs off the shocks and block the car/suspension to what you want for ride ht.
Adjust the drive angles---then figure out what distance you have for the spring at ride ht and go from there----you will probably be in the 10 in size
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