Measuring driveline angles is important when installing different engine, transmission and differential combinations into your car. A proper setup ensures smooth operation and normal wear from your driveline. Improper angles can cause excess fatigue on driveshafts, pinions and may lead to premature wear.
The folks at Inland Empire Driveline have put together a very good article detailing how to accomplish this so you can get the best performance from your new driveline. Download it here.