Originally posted by brotherGood
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As to measuring pinion angle - I am very much a "shade tree" mechanic - so here is what I do. Lift the car up enough to be able to get under it. You could put the car on jackstands with the rear stands under the rear axle so that the rear end is sitting at ride height.
I prefer to have the car sitting on the tires - not jack stands so I built wooden blocks to do this.
Others use a bunch of 2 x 4s
Once the car is up, you need a level that measures in degrees (10ths or better) to measure stuff.
First, I measure the angle on the driveshaft.
Next you have to measure the pinion itself. This can be complicated and varies greatly depending on your car.
On my junk, I tend to remove the driveshaft from the rear yoke and measure the angle of the yoke by placing a flat plate across the face and then using the level to measure that angle. IF you use this method, you then need to subtract that number from 90* so that you have a comparable number to the driveshaft. I have heard stories of people finding flat spots on the rear housing or yoke that is parallel/perpendicular to the pinion shaft and use that as a measuring point.
I hope I have totally confused you with this convoluted explanation.
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