If you read a lot about drivelines -- and I think even a post from David Pozzi - they DISAGREE with the Parallel and Zero degree driveline "rule". They say if you have a 'down' 3 degree at the engine - to set your rear end at ZERO...
I've personally always gone with the "rule" of parallel... but with a 4 link - there is no (or minimal) climbing of the pinion.... so I'm going to reset mine at zero when I get the 37 off the rack.
There is also driveline harmonics... so while you have a "new" driveline... there is MATH to be done to figure out the rpms to see what the CRITICAL RPMS your driveline diameter and length can handle. With overdrive trannys - and big tires etc... this can start to come into play. Although I would certainly not expect it at the speeds you say it comes in at... since you don't know what the 'cause is -- might as well investigate everything while you're at it.
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