Originally Posted by badyota82
Is it throttle sensitive? Have you had your driveshaft checked for balance? If your truck is not lifted sky high , there should be no need for double cardon joint, especially with a two piece shaft. How is the condition of you carrier bearing?
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It is not throttle sensitive, I get it at a steady cruise speed, accelerating up through it and decelerating down through it. It is there regardless of trans gear selected, even vibrates in neutral until the truck slows to less than 40. The center bearing looks fine as does all three joints. I have measured angles on transfer case output and pinion flange and they are within 1/2 degree of one another. I have played with shimming the center bearing down and that lessened the intensity of it but spread it over a larger speed range. I have adjusted the center bearing toward the passengers side of the truck to try to eleminate any compound angles, this was done by mounting a laser pointer on the damper at the pinion and taking measurments to get the shaft in a straight line. I want it to ride like a 3/4 ton truck, not a 3/4 ton truck with something wrong with it.
The really sad part of this is that the truck only has a leveling kit on the front, zero lift on the rear. I am looking at mail order due to simplicity, I can't miss work to hang out at a driveline shop half a day. Besides all the driveline shops are an hour or so away. I have a buddy that had one of these local driveline shops make a one piece shaft for project and they didn't do their math right. Too long and too small of diameter equals exploded shaft which busted trans case, removed fuel lines and other mean, nasty stuff to the bottom of the car. Minor trust issues there.