Page 4 of 4 FirstFirst ... 234
Results 31 to 40 of 40

Thread: Please help me - what's causing my drive shaft to make this noise shifting out of 4lo

  1. #31
    Been Around the Block nbunga's Avatar
    Join Date
    May 2017
    Location
    US
    Posts
    392
    Quote Originally Posted by tylerbrinks View Post
    Well - at least at the moment the 'official' answer is one I didn't expect. On top of replacing the u-joints I took my JK to two different dealerships, one of which has a 20 year transmission veteran. It's under warranty, so a free opinion can't hurt.

    The prevailing opinion is that the noise is totally normal for a CV shaft and, and simply a result of the torque built up in the drive line. There's still no explanation as to why. Loose non-threaded yoke at the t-case, contact with the centering yoke and the ears, who knows. Good news is the transmission and t-case have been verified in good order. So, unless anyone else has creative ideas, I sound like Sugar Ray going in for a knockout round every time I go wheeling.
    Did they address the issue of the transfer case popping out of gear?

  2. #32
    Old Timer VeruGE*144's Avatar
    Join Date
    Feb 2017
    Location
    Illinois, Chicago
    Posts
    3,287

    Please help me - what's causing my drive shaft to make this noise shifting out of 4lo

    My tcase likes to be a pain to engage into 4lo sometimes as well. Usually I do it while standing still and not even rolling, put the trans on neutral, use the tcase lever to shift into 4lo, then I keep a little pressure on the lever at 4lo position and use my other hand to pop the trans back into drive. Works like a charm.
    As far as the noise you are having, it is strange for sure. Maybe look for some take-of factory shafts at a good price, put them on and have the dealer look at it.

  3. #33
    Nothing but a Thing Arrcherr's Avatar
    Join Date
    Aug 2017
    Location
    Palos Hills
    Posts
    1,404
    Quote Originally Posted by VeruGE*144 View Post
    My tcase likes to be a pain to engage into 4lo sometimes as well. Usually I do it while standing still and not even rolling, put the trans on neutral, use the tcase lever to shift into 4lo, then I keep a little pressure on the lever at 4lo position and use my other hand to pop the trans back into drive. Works like a charm.
    As far as the noise you are having, it is strange for sure. Maybe look for some take-of factory shafts at a good price, put them on and have the dealer look at it.
    My tcase can be a PITA to get into 4lo as well. I started doing this after Matt suggested it and it works like a charm👍

  4. #34
    Fresh Catch
    Join Date
    Mar 2018
    Location
    Colorado
    Posts
    19
    Quote Originally Posted by VeruGE*144 View Post
    My tcase likes to be a pain to engage into 4lo sometimes as well. Usually I do it while standing still and not even rolling, put the trans on neutral, use the tcase lever to shift into 4lo, then I keep a little pressure on the lever at 4lo position and use my other hand to pop the trans back into drive. Works like a charm.
    As far as the noise you are having, it is strange for sure. Maybe look for some take-of factory shafts at a good price, put them on and have the dealer look at it.
    My only issue with replacing the CVs with factory shafts is that with the after market shaft installation I've already applied proper torque to the rear pinion's crush sleeve to get it back to about 10 inch pounds to turn the rear axle shafts. Going back to Mopar shafts and then a 4th time if I reinstall my CVs is likely going to end up crushing it beyond a usable limit and I'll end up burning up the bearing.

    Their recommendation was to put the car in neutral, engage the parking brake, and then park to keep torque off the drive line. Short of WJCO's method of audibly inspecting the internals, I'm not sure what options are viable at this point. Good news is the transmission and t-case keep their warranty even with the after market shafts. Worst case scenario is something breaks and I get a new setup

  5. #35
    Fresh Catch
    Join Date
    Mar 2018
    Location
    Colorado
    Posts
    19
    Quote Originally Posted by WJCO View Post
    It's easy for a dealer to give out the phrase "normal" like Halloween candy. I don't recall ever hearing a noise like that on any JK or any other vehicle for that matter.

    There is a tool out there called "chassis ears." It has a receiver that goes next to the driver. Then there are several microphone transmitters that are installed on various parts of the vehicle and they have numbers on them. The receiver can select each number individually. So when the noise occurs, the receiver will pick it up on channel 4 for example. Wherever you installed transmitter 4, that's the area that the noise is coming from.
    That's a great idea. I'm going to see if anyone in one of the local Jeep clubs has one I can borrow. At least then I could eliminate the transmission or t-case as the source of the issue. I might even try it with the drive shaft off and see if/how that changes any noises picked up. I took the drive shaft off entirely yesterday and gave the centering yoke a once over (visually it looked off) and installed a new u-joint up front but nothing changed. I think I may remove it again and leave it with the local fabricator while I travel next week. The part of the whole puzzle is why the drive shaft is making noise in the first place. There has to be impact or metal to metal somewhere. The shaft also has a warranty, so I might as well exercise it and eliminate that as a possibility.

  6. #36
    Meme King WJCO's Avatar
    Join Date
    Sep 2015
    Location
    Colorado
    Posts
    23,599
    Quote Originally Posted by tylerbrinks View Post
    That's a great idea. I'm going to see if anyone in one of the local Jeep clubs has one I can borrow. At least then I could eliminate the transmission or t-case as the source of the issue. I might even try it with the drive shaft off and see if/how that changes any noises picked up. I took the drive shaft off entirely yesterday and gave the centering yoke a once over (visually it looked off) and installed a new u-joint up front but nothing changed. I think I may remove it again and leave it with the local fabricator while I travel next week. The part of the whole puzzle is why the drive shaft is making noise in the first place. There has to be impact or metal to metal somewhere. The shaft also has a warranty, so I might as well exercise it and eliminate that as a possibility.
    I just realized your in Colorado. I have the tool. I'm just north of Denver. Send me a PM if you're close. I can't let you borrow it, but I'd be happy to help out and set it up with you if I can.
    Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you.
    RECOMMENDED JEEP PARTS & ACCESSORIES



    Support the JL forum: JLWRANGLER.COM

  7. #37
    Fresh Catch
    Join Date
    Mar 2018
    Location
    Colorado
    Posts
    19
    For those following along, I took the drive shaft off entirely and had the fabricator inspect it. They added a bit of weight to rebalance it, but otherwise confirmed it's in good shape. I'll reinstall the drive shaft and keep working on the troubleshooting process. For now here's what is known:

    1. Two different dealerships indicate the transmission and t-case are operating normally (take that for what it's worth).
    2. All the u-joints are in good shape. They're all the Spicer Life variety so no grease is needed. No play in them at all, and only 3000 miles on them.
    3. The transfer case yoke doesn't seem to have loosened at all (red thread lock). It's still torqued to about 160 ft/lbs.
    4. The pinion yoke appears to be torqued properly and still takes about 10 inch/lbs to rotate the axle shafts (preload). Preload was 5 inch/lbs before the after market shafts went on, and the new yoke was torqued until it took 10 inch/lbs which is in line with adding 5 inch/lbs to get the crush sleeve back to spec. That happened at 160 ft/lbs which just happens to be what everyone recommends as a default torque.


    The reason I mention the rear pinion yoke is that it's the source of my next theory. My thought is there could be too much backlash or pinion depth in the rear pinion & ring gear after installing an after market yoke. I'm thinking too much backlash/depth might cause metal to metal contact when the drive shaft (and thereby pinion) rapidly changes direction. We know that's when the noise occurs, and since the pinion is directly connected to the drive shaft (at least via the yoke) it seems like it's worth considering. The problem with that theory is the sound is easier to reproduce closer to the t-case, not the rear diff. The sound/impact would have to travel through the slip and up the stub shaft. It's no smoking gun, but at least something to try to measure. Trouble is I have no idea if i can test backlash without getting into the diff, nor do I have the tools to do so. Even if I did, I'm guessing I'd need a master install kit to do it correctly, and at that point I might as well regear
    Last edited by tylerbrinks; 07-09-2018 at 08:05 PM.

  8. #38
    Meme King WJCO's Avatar
    Join Date
    Sep 2015
    Location
    Colorado
    Posts
    23,599
    Quote Originally Posted by tylerbrinks View Post
    Trouble is I have no idea if i can test backlash without getting into the diff, nor do I have the tools to do so. Even if I did, I'm guessing I'd need a master install kit to do it correctly, and at that point I might as well regear
    You can check backlash with a dial indicator if you pull the cover off.

    As far as pinion depth, even if the crush sleeve moved a little during yoke replacement, as long as it's tight now with no play, the depth should be the same as it is set with a shim. The crush sleeve is there to properly preload the bearings.

    Regardless, I've seen some fucked up out of spec diffs and still haven't heard that noise you're hearing. Anything's possible but usually if something is out of spec in the diff, you'll have way crazier noises than that.
    Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you.
    RECOMMENDED JEEP PARTS & ACCESSORIES



    Support the JL forum: JLWRANGLER.COM

  9. #39
    Fresh Catch
    Join Date
    Mar 2018
    Location
    Colorado
    Posts
    19
    Quick update for those following along or having a similar issue.

    I'm traveling this week which means my JK is sitting in the garage not being worked on. In the meantime, I got the drive shaft back from the fabricator. He added a bit of weight, but otherwise gave it a clean bill of health. It would seem the shaft announces the issue, but isn't the likely source of the problem.

    Since I've been sitting in a hotel room with little to do, I've changed the search terms I'm using. Specifically, if I broaden the search to all vehicles instead of just Jeeps, I actually get results. It turns out other 4x4 vehicles like FJs, Tacomas, trucks, and even a few AWD vehicles have a similar issue. The 2 common causes seem to be u-joints (which I'm assuming are good) and parking pawls. Since the issue happens most often on an incline going from park to reverse, that puts the parking pawl or parking gear at the top of my list. Unfortunately I can't do anything about the possibility for at least another week, but at least I have a direction to continue research while I'm stuck in a hotel room. For those interested, here's a few (seemingly) related ideas:

    If you've never seen how a parking pawl/gear work for an automatic
    Similar issue from a Mustang
    The only relevant Wrangler post I've found
    Exploring the backlash idea further

  10. #40
    Meme King WJCO's Avatar
    Join Date
    Sep 2015
    Location
    Colorado
    Posts
    23,599
    Quote Originally Posted by tylerbrinks View Post
    Quick update for those following along or having a similar issue. The 2 common causes seem to be u-joints (which I'm assuming are good) and parking pawls. Since the issue happens most often on an incline going from park to reverse, that puts the parking pawl or parking gear at the top of my list.
    I could definitely see a parking pawl making a noise like that.
    Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you.
    RECOMMENDED JEEP PARTS & ACCESSORIES



    Support the JL forum: JLWRANGLER.COM

Page 4 of 4 FirstFirst ... 234

Similar Threads

  1. Replies: 33
    Last Post: Yesterday, 04:14 PM
  2. Drive shaft help!
    By Dopey84 in forum Jeep JK Wrangler
    Replies: 4
    Last Post: 05-01-2017, 05:20 AM
  3. Drive shaft
    By Bmans08jk in forum Jeep JK Wrangler
    Replies: 7
    Last Post: 03-17-2017, 10:30 PM
  4. Strange noise from transfer case/drive shaft area
    By mattfl in forum Jeep JK Wrangler
    Replies: 11
    Last Post: 05-31-2015, 07:33 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
“wayoflife” is a moniker that I’ve been using for 20 years now and I chose it because I think it does a great job of explaining, in simple terms, the passion I have for Jeeps and the Jeep way of life. This is a lifestyle that transcends age, gender and race as the only thing you need to be a part of it is a love for the outdoors, a desire to explore, a yearning to take on a challenge and a will to conquer it. Over the years, Cindy and I have attempted to capture the essence of this lifestyle through photographs and videos and share it with others around the world. And, this is how WAYALIFE was born.
Join us
WATCH OUR VIDEOS