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mysterious vibration

654 views 1 reply 2 participants last post by  K9Kodi 
#1 ·
I have this illusive vibration that i can't seem diagnose. Truck specs are in my sig

The vibration happens only during declaration and say about 30 mph. I will accelerate, let my foot off the gas and I can feel it in the floor board. it happens every time but the vibration isn't constant. It will vibrate for 2 sec, stop, vibrate for another 1 sec, stop.

Heres what i have done so far to try and diagnose it:
Rebuilt and balanced both driveshafts = no change
Removed front drive shaft = no change
put it in 4wd= same vibrate but more noticable
shut engine off while driving = no change

my next step is tire balance and alignment. Any other ideas?
 
#2 ·
yeah, look at your 4wd unit. check the output shafts, you know, where the front drive shaft and rear drive shaft come out. check for work bearings in the front output pinion/shaft
 
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