I had that with my s-10 blazer.
I replaced the u-joints and POOF gone!
Worth looking at.
-----Original Message-----
From: K. Spence <kspence@intermind.net>
To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
Date: Thursday, June 17, 1999 1:44 PM
Subject: DML: Vibration at 30mph
>I've noticed a vibration in my truck while cruising at 30mph. I've only
>had the thing a month. Its a 93 CC 4x2 with 60K miles. It actually
>vibrates from 25 to 35, peaking at around 30 or so, and it does it with
>the tranny in or out of gear (so it's not engine related - I can
>actually shut off the motor for a few seconds and coast and it is still
>there). I've felt vibrations of out-of-balance tires, but that usually
>requires freeway speeds, and that kind of vibration is a little softer
>since the suspension absorbs some of it. This is a very distinct rumble
>that I can't tell the direction it is coming from, and I doubt is tire
>oriented. As I get up to 40+ mph, the vibration frequency is so fast,
>that you don't feel it anymore. I'm thinking drive shaft, or the drive
>shaft bearing, or maybe a wheel bearing...
>
>Any ideas?? I'm going to jack up the back end and get the drivetrain
>moving with the wheels off the ground and see what I can figure out.
>
>Thanks in advance...
>
>Kevin
>
>
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