Wow Dave, those are some serious angles. Mine was in the 7 range and I wasn't happy with it. I have some engine harmonics between 2650-2950 that compound it. I dropped my pinion angle down to .5 up to reduce the working angles and it improved it considerably. I ran out of threads on my adjusters but have new ones sitting here. My next plan is to lower the pinion to -.5 where I've basically taken the pinion out of the equation and that will lower the front working angle to 3.5-4 with a rear of approx .5. If I'm still not happy I'll lower the pinion angle to -2 and that will give me working angles of approx 2.5- 3 front and back. They wont' be equal and opposite but they will be small. From my research, when driveshaft speeds get to only 4000 rpm they don't recommend working angles over about 3 degrees. That's only approx 85mph with a .64 overdrive. Of course that's for silky smooth factory applications with miles and miles of reliability. When angles get so huge the driveshaft has to slow down and speed up more dramatically even with equal and opposites. It's one of those deals where I'm running solid body mounts, engine mounts, and QA1 rod ends to harness the power but want super smooth high speed drivability. That may eventually mean some tunnel mods to get those working angles minute. I'll try to remember to report back after my changes. Not sure when I'll get to it.
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Todd
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