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Discussion Starter #1
I have a 2000 GMC Sonoma with the 4.3 Vortec. great truck, hauls ass, but it has a massivee vibration under load. It seems to be only at certain RPM's, but in a higher gear, the vibration is less dramatic. Any suggestions? I checked the intake, put in an OEM replacement filter (original was warped) . Maybe motor mounts, Driveshaft? Wheels are balanced. oh yeah, and it's a 2by.
 

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165 Posts
Discussion Starter #4
definately u-joints? k. i'll jack it up and pop a look. anything i should be looking for in a u-joint? warped, broken, cracked, worn, stuff like that?
 

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Yep, UJoint. They should be rock solid. If they have ANY play in them, replace them both. Even if one is shot, do 'em both at the same time because the other one is likely right around the corner.
 
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