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Vibration at 100 mph

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Old 04-16-2010, 10:05 PM
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Default Vibration at 100 mph
Feels like u-joints/drive shaft are vibrating at 100-103 mph then stops as speed increases. Starts at the same speed when slowing down from 105+
what is this from and how to fix?
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Old 04-16-2010, 10:37 PM
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moved from the GMT900 section....

first of all, it would help to know your truck/mods
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Old 04-16-2010, 10:47 PM
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2010 sierra 2" shackles in the back and removed the 1 1/2" blocks. I though it might need a pinion shim but others have done it said it's not needed
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Old 04-16-2010, 11:05 PM
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some may and some may not. You can try 2* shims and see if it helps or worsens.
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Old 04-16-2010, 11:43 PM
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if its not the pinion its probably tires or driveshaft
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Old 12-15-2010, 05:19 PM
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is it a crew cab? the one piece long driveshaft will do it
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Old 12-15-2010, 05:22 PM
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can someone explain/show where the shims are supposed to be placed?
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Old 09-07-2012, 10:01 PM
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Which gears u have? I've found out that the one piece drive shaft in fact will do that especially after I swapped to 410s(the drive shaft having to spin faster)
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Old 09-07-2012, 10:09 PM
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Originally Posted by abey15
Which gears u have? I've found out that the one piece drive shaft in fact will do that especially after I swapped to 410s(the drive shaft having to spin faster)
Damn man you raised the dead with bumping this thread, lol it's from 2010.
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Old 09-08-2012, 07:47 AM
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The op has 3.73's.
I just got mine tuned and it did the same right after 100.
It's a 1 piece aluminum d/s and truck is leveled 2" in front.
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