02 Denali with bad side to side sway at n over 55mph.....WTH??!!

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tsb09000

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Sounds like a problem I had a while back. The rear most bolt on the driver side rear lower control arm/trailing arm was the culprit. Somehow the hole in the bracket was larger than the one on the arm itself causing it to move. So I got a bigger bolt and slightly reamed out the bushing on the arm and that's all it was the whole time. Literally a $3.99 fix.
Have someone stand on the rear bumper and slightly bounce up and down while looking at the trailing arm bolt locations. There was just a little movement there but it translated to quite a bit overall. I'm not sure I would have ever found it without the second person.
 
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Renzo778

Renzo778

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I actually disconnected the sway bar from the links n shifted it over just a bit. Reconnected everything and it drives 90% better
 

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