vibration from 25 to 35ish

[ak_cowboy]

Well I have determined that it is not the T/C. When I drive down the road, from 25 to about 35 I get a vibration. I don't notice it much after that but during that time, it feels like T/C shutter it is that bad. Any thoughts on what this is. I have a tiny amount of play in the center support area but hardly noticable. I jacked the back up and did a test to ensure that it wasn't the front end. Please help!!! It is driving me mad.

[dreadhed]

I had the same problem. It was the U-joints. That is what I would check. I had to replace my center carrier bearing & U-joints.

[jlmendoza]

Have you changed u-joints lately? If you don't mark the shafts so that they are lined up the same way they were installed/balanced from the factory you can get a vibration. Also especially with a crew cab the center carrier bearing/support could be failing, I replaced mine when I did the u-joints, it felt kinda of sloppy, especially compared to a new one, but, it needs to be pressed on & off. Check & make sure that none of the u-joints appear to be failing & that the pinion flange nut is not loose, or a drive shaft balance weight has not fallen or been scraped off, also check tire balance & wheel bearings. A poor mans balance is to use 2 hose clamps just large enough to fit the drive shaft put a chalk mark where the clamp screws line up, the vehicle needs to be very firmly stable on jack stands and slowly start vehicle slowly building up to problem speed move 1 hose clamp about 1/4" at a time from a safe distance you be able to observe the drive line vibration decrease, then move the other clamp 1/4" in the other direction until vibration is eliminated.

hope this helps.
jerry

[ak_cowboy]

Well I think I got it. The center support was a little misaligned from my ujoint replacement. I straightened it out and it is almost completely gone. Thanks