Magic driveshaft?

[sargar]

Is anyone running a driveshaft with a cv or double cardan behind the center bearing? I have what feels like a driveshaft imbalance at 40-45 mph and was considering a new shaft if I could find some positive feedback on this setup.

[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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[CT Performance, Inc.]

When lifting over a certain height the adding of a CV will solve all the problems..from the DS angles..I've used them and end result is the smoothest DS I've had on a lifted truck

[sargar]

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.

[badyota82]

I don't blame you on that one bit, hard to find people that do good quality work these days unfortunately. I was hoping you would not have tried anything you already have, since that is what I was going to suggest you check. I am having the EXACT SAME problem with my 82 Toyota that you are having with your truck. All I can think of at this point, and what I am in the process of checking on my Toyota, is the transfer case input and output bearings. I have double cardan joints on this truck and have double and triple checked everything except the t-case bearings. Wished I was done with it now to offer you more advice based on my experience, but I'm waiting on parts right now so it will be awhile yet before I know if that is the cause of the problem is.

Let me know if you find anything or have any luck figuring out your pain in the arse!


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