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| Driveline thumps at certain speeds http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=3&t=87288 |
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| Author: | greiswig [ Sat Oct 14, 2017 12:27 pm ] |
| Post subject: | Driveline thumps at certain speeds |
Hi, all, I’ve got an ‘05 CRD with 175k on it. It also has one of the early lifts on it, barely enough to run 245/75-16 tires. Front shocks have been bad for quite awhile, so I just replaced them. Ride is firmer, but now I’m noticing something that makes me nervous. Maybe the bad shocks were masking it, or maybe the new shocks are bringing it out, but... At right around 50mph, I start feeling this fairly regular vibration in the driveline. But it’s almost like you’re driving on a road that has had a lot of cracks fixed: you feel it more than hear it. It is probably about one thump per tire revolution, but that’s kind of hard to say. Doesn’t seem to matter whether it is in AWD, or if the transmission is in neutral. First thing when I noticed it was take it to the tire shop. They balanced and rotated the tires, and didn’t see anything the likened to tread separation. But the issue is still there. Any thoughts on what this is likely to be or how best to trace it down? Kind of hard to diagnose when it only happens at speed. Thanks! |
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| Author: | tommudd [ Sat Oct 14, 2017 12:35 pm ] |
| Post subject: | Re: Driveline thumps at certain speeds |
Early lift?? What brand ? Never replace just shocks, springs and shocks work together , replace one and the other works harder Check rear u-joints and also check the CV on the rear part of the front driveshaft Also could be the right side CV and intermediate shaft going bad Only lifts that works is the OME with 790 front springs and 948 rear along with OME shocks or the JBA adjustable coilover lift with the heavier springs for the CRD |
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| Author: | greiswig [ Sun Oct 15, 2017 1:41 pm ] |
| Post subject: | Re: Driveline thumps at certain speeds |
Thanks for the input, Tom. I’ll see if the driveshafts seem okay, and try to search for a write up on that intermediate shaft. |
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