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  #11  
Old 05-14-2008, 09:13 AM
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Driveshaft.
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  #12  
Old 05-14-2008, 09:24 AM
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Sounds like to mucch grease in the shaft, not U joints. Common problem

http://forum.ih8mud.com/80-series-te...oting-faq.html

post 5 item 4
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  #13  
Old 05-14-2008, 09:45 AM
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Hmm...I have not greased the shafts in months...and only added a little to 1 yesterday...I will go read the link, thanks Romer!

T
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  #14  
Old 05-14-2008, 09:57 AM
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Could still be U joints. Use the full link to troubleshoot including removing shafts to isolate
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  #15  
Old 05-14-2008, 10:08 AM
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I would take your rear driveshaft off and have balance checked. That sounds exactly like a rear driveshaft on an 80 that got nudged out of balance. I have found that enough candy caning of the rear shaft will show up as an increasing vibration at those low speeds.
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  #16  
Old 05-14-2008, 10:36 AM
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Definitely sounds like u-joint based on symptom description. Vibrating at a certain speed under a certain load (or opposite - when coasting) has always been the hallmark of every worn out u-joint I have ever had.
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  #17  
Old 05-14-2008, 10:44 AM
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Quote:
Originally Posted by Rzeppa View Post
Definitely sounds like u-joint based on symptom description. Vibrating at a certain speed under a certain load (or opposite - when coasting) has always been the hallmark of every worn out u-joint I have ever had.

I agree 100%. take the DS of and inspect the U joint of the truck. On the truck it can still seem to be good if it is just starting to go. Once it is badly worn it will squeal and vibrate at lower speeds too.
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  #18  
Old 05-14-2008, 11:08 AM
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Just pull the driveshaft and have it checked for true, balance, and U-joint condition.
Englewood Driveshaft.
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  #19  
Old 05-14-2008, 11:41 AM
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It may sound funny... But especially since you mention the (possible) misfire at excelleration, and being more pronounced under load, you might just have bad spark or wire. I too have experienced vibration in my drivetrain that to my surprise was fixed by checking/replacing a plug wire. Just a thought.
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  #20  
Old 06-30-2008, 10:53 AM
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Ends up being a bad u-joint on the front driveshaft. Looked fine the first couple of times I checked it out, but the noise has been getting worse so took a look and it is bad. Installed the CDL switch so I could remove the front DS. Took a look here on replacing the u-joint http://forum.ih8mud.com/80-series-te...your-80-a.html and not sure when I will have the time nor patience to tackle this. Will order up a new u-joint from Stevinson today, where would be good to replace it? Thanks.

T
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