Vibration at 100 mph

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Apr 16, 2010 | 10:05 PM

bagz

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From: Cecilia, LA

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?

Apr 16, 2010 | 10:37 PM

trever1t

2nd fastest 5.3 ECSB

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From: NorCal

moved from the GMT900 section....

first of all, it would help to know your truck/mods

Apr 16, 2010 | 10:47 PM

bagz

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From: Cecilia, LA

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

Apr 16, 2010 | 11:05 PM

trever1t

2nd fastest 5.3 ECSB

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From: NorCal

some may and some may not. You can try 2* shims and see if it helps or worsens.

Apr 16, 2010 | 11:43 PM

Atomic

I have a gauge for that

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From: Huntsville, AL

if its not the pinion its probably tires or driveshaft

Dec 15, 2010 | 05:19 PM

fastjweb

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From: NewBern NC/Lake Havasu City AZ

is it a crew cab? the one piece long driveshaft will do it

Dec 15, 2010 | 05:22 PM

GMCtrk

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From: Dallas

can someone explain/show where the shims are supposed to be placed?

Vibration at 100 mph

Vibration at 100 mph

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