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Well, I hate to tell you this but lets start over.
1.) Get the car up in the air with the car supported on the rear axle and the front supported around the front suspention.
2.) Take the driveline off the pinion yoke.
3.) Measure the angle on the pinion yoke were the caps bolt to.
4.) This should give you a measurement with the needle on one side of 90* towards the front of the car or towards the back of the car. Record it.
5.) Put the driveline back on
6.) Now put the tool on the bottom of the driveline and take another measurement. Again it should be on one side or the other of the 90* mark toward the front or back of the car. Record it.
7.) Now that all that is done if one measurement is 4* toward the back and the other is 2* toward the front your pinion angle would be 6*.
8.) If they are both the same way (toward the back) 4* and 2* then your pinion angle is 2*.

Hope all this helps!

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Great explaination. Rates right up there with the best.