One of those small digital angle gauges is a great tool for measuring driveline angles - put a quality socket on the end of the uni cups when straight up and down to get the diff and box angles. There's zero guess-work in this part, front and rear should be equal and opposite to cancel them correctly (also make sure you have suitable operating angles for the joints).Beyond that its a matter of accounting for the potential movement of the diff, start with a jack and seeing how much movement you can introduce via the bushings (people are telling you 3 degrees as an approximation, depends on suspension design, bushings, how much load it actually sees). Beyond that if you really need to find tune for specific activities you may need to get creative (camera under the car?) but that's probably taking things a bit far for most of us.
Thanks for the post.
Your description is how I set my angles. (I have adjustable top arms).
I agree setting up a camera is too far for me too. It's just that I have been trying to understand this diff angle set up for drags for a while. I'm not making enough power or am I fast enough for this to matter on my car. It's all just curiosity.
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