ghetdjc320 Posted January 10, 2020 Share Posted January 10, 2020 Been dealing with a weird noise for a few months now. It first started on a 500 mile drive from Arkansas to Texas. It is frequent but doesn’t have a definite rhythm. It sounds like a bearing going bad. Kind of a lite metal grinding noise almost like a bad u joint. It starts around 20 mph and comes and goes at random intervals. Here Are some more details: new front and rear gears (revolution 4.56) with bearings rear has a truetrac and revolution chronology shafts just replaces the rear axle bearings and seals replaced front unit bearings rebuilt transfer case engine has about 8000 miles since full build new axle shaft u joints Tried transfer case in neutral and ran transmission through all gears (aw4). Tried jacking up rear and running it while listening for noises. Transmission oil is very clean and at the proper level. I am at a loss as to what this noise is. I’m grasping at straws but please let me know if you have any ideas. Also, keep in mind that I’m in Guam so specialized tools are not readily available. thanks in advance! Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 10, 2020 Author Share Posted January 10, 2020 Also have new front and rear driveshafts and u joints to eliminate that as a cause Link to comment Share on other sites More sharing options...
Andy in Pa Posted January 10, 2020 Share Posted January 10, 2020 Do you notice more when turning? Due to the range of new parts you have done recently, you have eliminated 80% of the possibilities. Do the front brakes have the spring clips in place holding the pads properly? This can cause a light scraping and clunking or clicking sound if they are not clipped in place properly. Sounds very much like something more serious too. Link to comment Share on other sites More sharing options...
eaglescout526 Posted January 10, 2020 Share Posted January 10, 2020 The rear ebrake cables can make a scraping sound and rub on the back side of the rim. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 10, 2020 Author Share Posted January 10, 2020 6 hours ago, Andy in Pa said: Do you notice more when turning? Due to the range of new parts you have done recently, you have eliminated 80% of the possibilities. Do the front brakes have the spring clips in place holding the pads properly? This can cause a light scraping and clunking or clicking sound if they are not clipped in place properly. Sounds very much like something more serious too. No difference when turning. The brakes just have the clips for the piston but otherwise they are just floating on the “wings”. It does sound a bit like something rubbing the rotors outer edge but I don’t believe it’s coming from the brakes at all Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 10, 2020 Author Share Posted January 10, 2020 6 hours ago, eaglescout526 said: The rear ebrake cables can make a scraping sound and rub on the back side of the rim. checked that too and there isn’t any interference. Link to comment Share on other sites More sharing options...
Warren Mohler Posted January 11, 2020 Share Posted January 11, 2020 I have seen later style 231 rear output seals make noise Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 11, 2020 Author Share Posted January 11, 2020 1 hour ago, Warren Mohler said: I have seen later style 231 rear output seals make noise rebuilt np231 with new output housing/seal and bushing Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 11, 2020 Author Share Posted January 11, 2020 I’m thinking front diff possibly. Will investigate further. Link to comment Share on other sites More sharing options...
Andy in Pa Posted January 11, 2020 Share Posted January 11, 2020 5 hours ago, ghetdjc320 said: No difference when turning. The brakes just have the clips for the piston but otherwise they are just floating on the “wings”. It does sound a bit like something rubbing the rotors outer edge but I don’t believe it’s coming from the brakes at all There are these spring clips that go over the "wings" on the brake pad mounts that provide a bit of resistance to the pads so they are not able to float as much. What happens is the actual "wings" that the brake pads ride on get grooves worn into them over time by the metal bracket on the pads, which allows the pads to float more than they should. There is no way to truly fix this besides putting on new outer knuckles, but those spring clips help control the pad float. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 11, 2020 Author Share Posted January 11, 2020 2 minutes ago, Andy in Pa said: There are these spring clips that go over the "wings" on the brake pad mounts that provide a bit of resistance to the pads so they are not able to float as much. What happens is the actual "wings" that the brake pads ride on get grooves worn into them over time by the metal bracket on the pads, which allows the pads to float more than they should. There is no way to truly fix this besides putting on new outer knuckles, but those spring clips help control the pad float. interesting, I’m running black magic pads but they didn’t come with the clips you are referring to. Even with the floating though, I can’t see how they could cause the grinding noise I’m hearing. Also, the noise doesn’t change while braking. I was planning a swap to the pre 90 knuckles for brake upgrades after I fix this stupid noise though. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 11, 2020 Author Share Posted January 11, 2020 I was try to think of what this noise sounds like to give more perspective. The closest think I can think of is a drill press at like 300 rpm drilling lightly into heavy steel. Definitely a metal on metal sound. I wish I could record it clearly Link to comment Share on other sites More sharing options...
Andy in Pa Posted January 11, 2020 Share Posted January 11, 2020 2 minutes ago, ghetdjc320 said: interesting, I’m running black magic pads but they didn’t come with the clips you are referring to. Even with the floating though, I can’t see how they could cause the grinding noise I’m hearing. Also, the noise doesn’t change while braking. I was planning a swap to the pre 90 knuckles for brake upgrades after I fix this stupid noise though. Ok, yes it should definitely go away when braking. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 11, 2020 Author Share Posted January 11, 2020 Here is a short video clip on the drive home. The phone was able to pick up the noise especially around the last 3-4 seconds of the video. IMG_0911.MOV Link to comment Share on other sites More sharing options...
schardein Posted January 11, 2020 Share Posted January 11, 2020 I had a light roaring noise in my high mileage XJ that would come and go. Turned out the old rubber transmission mount was oil soaked and super mushy. New trans mount solved it. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 11, 2020 Author Share Posted January 11, 2020 My trans mount is new too Link to comment Share on other sites More sharing options...
ghetdjc320 Posted January 25, 2020 Author Share Posted January 25, 2020 Turns out the noise is my carrier bearing. They are new but it must have been damaged when installed or defective. Will get all the diff bearings swapped out Link to comment Share on other sites More sharing options...
ghetdjc320 Posted May 31, 2020 Author Share Posted May 31, 2020 Just incase anyone sees this in the future, I rebuilt my ring and pionion and installed new bearings and set the proper preload, backlash etc. Everything turned out great, but the noise was still there... Turns out it was actually the front transfer case output shaft rear needle bearing. The noise was very hard to pinpoint and it’s that ridiculously hard to get out bearing. Part number J2416 from Timken. Link to comment Share on other sites More sharing options...
BeatCJ Posted June 1, 2020 Share Posted June 1, 2020 Thanks for the follow up. Link to comment Share on other sites More sharing options...
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