-2 is MAX you want on a street driven 3 link car. any more puts the pinion bearing and/or seal at risk. I set mine at 1.9 using a simple angle finder app on my smartphone and a similar process to what is illustrated above. I used the rear half of the DS for my measure of DS angle, as that is what matters with a 2 piece shaft, not the transmission's position; then the pinion flange for the rear end's measure.
It's easy when you are able to conceptualize what you are looking at.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.38 at 120.85
2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP