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As a starting point you'll want the front shaft angle as close as the trans angle. Then you'll want the rear shaft working angle and the pinion working angle within 3*. Check for vibration. Sometimes this is not able tobe done, so you have to try it a few times. Some case will require the pinion up, some down to eliminate vibration. The best advice is to get an angle finder and take measurements, then make adjustments. I have a RCSB and it took a month to get it figured out. There are a lot of online sources for this topic. If you get measurements, That would help. You'll want the suspension loaded on the rear and the truck fairly level to make accurate measurements.
 
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