Ringing noise from CV drive shaft shifting out of 4lo
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JK Newbie
Joined: Jun 2017
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From: Denver, CO
Ringing noise from CV drive shaft shifting out of 4lo
I have a 2017 automatic JKUR which has had a CV drive shaft for about 3000 miles. Just recently I've been getting this ringing noise when I shift from 4lo back to 4hi. The sound is absolutely coming from the drive shaft because:
Here's a video shifting from 4hi to 4lo demonstrating the issue:
https://streamable.com/s/uu6ro/lsdktp
For what it's worth, it also happens occasionally when shifting from Park to Reverse or from Drive to Reverse.
I really need some good advice or ideas on this one. Thanks a million for the help!!
- Tapping the drive shaft's body with a wrench yields the exact same sound.
- I removed the drive shaft from the t-case and the noise doesn't happen when it's disconnected.
Here's a video shifting from 4hi to 4lo demonstrating the issue:
https://streamable.com/s/uu6ro/lsdktp
For what it's worth, it also happens occasionally when shifting from Park to Reverse or from Drive to Reverse.
I really need some good advice or ideas on this one. Thanks a million for the help!!
Thread Starter
JK Newbie
Joined: Jun 2017
Posts: 4
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From: Denver, CO
I've been stuck in that WTF mode myself now for a few weeks. So odd - best guess is a bad U-Joint even though they're the brand new and the Spicer greaseless type.
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JK Newbie
Joined: Jun 2017
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From: Denver, CO
Solved!
I found the cause and it's a simple fix. First off, there's not a problem, but it's a huge annoyance. There's no damage being caused. In short, it's an issue of harmonics. I did a whole write up on Wayalife if you want the full details. To fix it you'll have to take the shaft to a local driveline shop and have them insert a cardboard tube inside the shaft. They'll cut off one end, insert the tube, and weld it back together. Took them less than a day for me. And about $100. It's not at all uncommon and it'll stop The ringing.
Last edited by tylerbrinks; Sep 2, 2018 at 10:42 AM.
JK Newbie
Joined: Sep 2018
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From: In a house
I found the cause and it's a simple fix. First off, there's not a problem, but it's a huge annoyance. There's no damage being caused. In short, it's an issue of harmonics. I did a whole write up on Wayalife if you want the full details. To fix it you'll have to take the shaft to a local driveline shop and have them insert a cardboard tube inside the shaft. They'll cut off one end, insert the tuve, and weld it back together. Took them less than a day for me. It's not at all uncommon and it'll quiet it right up.
This is my 12th jeep, 4th jkur and I've done drive shafts on 90% of those jeeps and never had a "harmonic" issue like this. This is happening at dead stop to 4 mph when engaging the transfer case.
My biggest question would be if this is a sound issue why am I feeling it. Watching your video you can see the yoke physically move/shake when the sound is made like it's binding or grabbing on something. I had an auto trans yj in the mid 90's that made a similar sound when putting it in gear. Not engaging the tcase, just going reverse to park, park to drive etc and it was because the trans was basically toast after 176k miles of hard wheeling and dd'ng.
I did the exact same shafts on a '14 jkur hard rock a year ago and did not get this sound. This current jeep is a '15 auto trans, jkur with less than 25k miles on it that belonged to a college professor who never went on so much as a gravel road. I've got service history showing where he took it to have air put in the tires and had the DEALER wax it so it's not like the tcase or trans are bad. Everything was silky smooth before i put these shafts in. Will call adams in the morn and get their input.
Thanks.
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JK Newbie
Joined: Jun 2017
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From: Denver, CO
I didn't realize you had a physical sensation. My t-case and transmission are in good shape and lash is within spec at the t-case and diff. My issue was purely noise related.
If you can feel something, that would be a u-joint 99% of the time. Did you install it yourself? I'd start with checking for play with your hand. Aside from taking up the lash, it should be totally tight with virtually no play. I'd then put it up on jack stands and see if you can reproduce it with the rear wheels off the ground. That will also let you check the play between pinion and carrier. If you did your own install, did you message pinion preload before and after installation? It should be 10 inch pounds more than where it started. It could be the pinion nut wasn't property torqued which would explain a feeling at low speeds but stable once moving.
If it's the drive shaft, it's easy enough to remove it and check the play on the joints. But since they're new I'd suspect something with the installation is just out of tolerance.
Shoot me some details on the steps used for the installation and we can go from there to eliminate the usual stuff.
Here's the link my thread https://wayalife.com/showthread.php/...ing-out-of-4lo
If you can feel something, that would be a u-joint 99% of the time. Did you install it yourself? I'd start with checking for play with your hand. Aside from taking up the lash, it should be totally tight with virtually no play. I'd then put it up on jack stands and see if you can reproduce it with the rear wheels off the ground. That will also let you check the play between pinion and carrier. If you did your own install, did you message pinion preload before and after installation? It should be 10 inch pounds more than where it started. It could be the pinion nut wasn't property torqued which would explain a feeling at low speeds but stable once moving.
If it's the drive shaft, it's easy enough to remove it and check the play on the joints. But since they're new I'd suspect something with the installation is just out of tolerance.
Shoot me some details on the steps used for the installation and we can go from there to eliminate the usual stuff.
Here's the link my thread https://wayalife.com/showthread.php/...ing-out-of-4lo
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JK Newbie
Joined: Sep 2018
Posts: 3
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From: In a house
I didn't realize you had a physical sensation. My t-case and transmission are in good shape and lash is within spec at the t-case and diff. My issue was purely noise related.
If you can feel something, that would be a u-joint 99% of the time. Did you install it yourself? I'd start with checking for play with your hand. Aside from taking up the lash, it should be totally tight with virtually no play. I'd then put it up on jack stands and see if you can reproduce it with the rear wheels off the ground. That will also let you check the play between pinion and carrier. If you did your own install, did you message pinion preload before and after installation? It should be 10 inch pounds more than where it started. It could be the pinion nut wasn't property torqued which would explain a feeling at low speeds but stable once moving.
If it's the drive shaft, it's easy enough to remove it and check the play on the joints. But since they're new I'd suspect something with the installation is just out of tolerance.
Shoot me some details on the steps used for the installation and we can go from there to eliminate the usual stuff.
Here's the link my thread https://wayalife.com/showthread.php/...ing-out-of-4lo
If you can feel something, that would be a u-joint 99% of the time. Did you install it yourself? I'd start with checking for play with your hand. Aside from taking up the lash, it should be totally tight with virtually no play. I'd then put it up on jack stands and see if you can reproduce it with the rear wheels off the ground. That will also let you check the play between pinion and carrier. If you did your own install, did you message pinion preload before and after installation? It should be 10 inch pounds more than where it started. It could be the pinion nut wasn't property torqued which would explain a feeling at low speeds but stable once moving.
If it's the drive shaft, it's easy enough to remove it and check the play on the joints. But since they're new I'd suspect something with the installation is just out of tolerance.
Shoot me some details on the steps used for the installation and we can go from there to eliminate the usual stuff.
Here's the link my thread https://wayalife.com/showthread.php/...ing-out-of-4lo
I installed them based on the same way I've installed the last three sets from Adams's. Pretty sure their write up/video is on their page somewhere. Never had this issue. Only thing I can think of is something is out of spec with the yoke, maybe. And that's just a guess and abject frustration. My flight lands at midnight. If it's not raining by the time I get home I'm doing a test ride and pulling the drive shafts. The '14 jkur hard rock I used to own has a 3.5" lift (I'm at 4.5") with the exact same shafts is 25 min away from my home and if he's home I'm going to borrow his shafts tomorrow for a few hrs to see wtf is going on because I'm out of ideas.
side note: I had my buddy go thru the service records the po left in the jeep. Thought maybe I missed a service record of a trans/tcase issue. Nope but he did find that for some reason this guy ran 93 premium from the day he bought it and had each fill on an excel spreadsheet stuck in the folder. With that level of anal retentiveness I know damn well it's not the tcase.