1995 GMC sonoma severe vibration while accelerating?

A Guy

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When i accelerate in my sonoma above 25mph there is a pretty severe vibration. I cant really tell if it is coming from the front or the rear because it kind of shakes the whole vehicle, any ideas what might be causing it and how much it will cost to fix? a friend of mine said it sounds like it might be a u-joint.
 
Yes, I would agree with your friend regarding the u-joints. You can just slide under the truck and try to rotate the driveshaft at both the front and the back. Does it move? Can you move/rotate it? If so, take it to a driveline shop and have them take a look. You can also accelarate to 25mph and take it out of gear - does it still vibrate? That takes the transmission and torque converter and/or clutch out of the equation. U-Joints might run about $100 to $150 to replace. Replace them both.
 
Check the U joints and the Transmission Mount. You GM is 14 years old and it's a good chance that the Transmission mounts may have gone bad and needs to be replaced. Have a shop verify line pressure, and provided no valves in the TCC hydraulic circuit are worn, replace the torque converter. Also, Lubegard Shudder Fix will at least fix this for awhile. Or try a transmission flush by a shop that uses BG brand products or there is a gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R. Also try a transmission flush with BG brand products (Firestone stocks it).
 


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