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2003 chevy trailblazer_ls
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22 Posts
Discussion Starter #1
2003 Trailblazer 6cyl 4WD LS Starts vibrating through the steering wheel and can feel it generally at about 30mph. If I let off the gas, the vibration stops. It is a rust-bucket on the bottom side, but the universal joints "look" OK. I don't feel any looseness, but that doesn't guarantee anything. Any suggestions as to isolating the problem i.e. rear end, transmission, drive shaft?? It shifts O.K. in 2 wheel, 4 wheel high, 4 wheel low.
 

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2004 gmc envoy_slt
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2,249 Posts
If you feel it thru the steering wheel, it probably is related to the front suspension. All joints and bushings need to be checked for wear. Unbalanced tires can also be a source.
 

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2003 chevy trailblazer_ls
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22 Posts
Discussion Starter #3
Good thought. However, it does not vibrate while coasting, only under power.
 

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Just for kicks-n-giggles, let's go back to the u-joints for another visit.

This time bring a moderately sized screwdriver and a couple of fingers.

Insert the screwdriver between one of the u-joint cross shafts and gently try to twist the u-joint back and forth.... all the while have a finger inside the area to feel if there is any motion that you cannot see.

There should be no motion at all.
 

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2002 olds bravada
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I just had this same issue with my 02 Bravada. It ended up being the front cv axles. I changed them out and the problem was gone. You might want to check them as well.
 
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