and gain access to Reviews and Discussion of the 2016 and 2017 Ford Explorer Tech Tips, How to Articles, Off-Road Modifications and Events, Street Truck Mods and Events, and much more! Since 1996 our community has covered every aspect of the Ford Explorer, Ford Ranger and all vehicles based on this platform.

Register Today It's free! This box will disappear once registered!

Strange Humming Noise From Rear....2002 Explorer

Discussion in 'Stock 2002 - 2005 Explorers' started by gbranh, February 5, 2010.

  • Searches ExplorerForum.com
    1. gbranh

      gbranh New Member

      Joined:
      November 30, 2009
      Messages:
      28
      Likes Received:
      0
      Trophy Points:
      0
      My wife's 2002 Explorer XLT, 4.0L, 4x4 has developed a humming noise from the rear of the truck, concurrent with wheel speed. Putting the tranny in neutral at speed does not make it go away, nor does putting it in 4HI. The tires look fine, and a cursory visual inspection of all 4 rear CV boots suggests that they are in good shape, as well.

      The truck has 110,000 on it, and the tranny has recently been given a clean bill of health by a local, trusted tranny shop. I don't believe it's brake-related, but I'll inspect this weekend.

      I remember a similar noise on a Saturn VUE we had several years ago. That turned out to be a bad wheel bearing. I wonder if this is the same situation?

      Is there a common failure on these trucks with respect to wheel bearings? I've never done anything with the rear IRS on these trucks, so I don't really know where to start looking.

      Thanks for you help,

      Greg
       
    2. Support EF


      Join the Elite Explorers for $20 a year

      Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose and fix problems yourself, and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, add your own profile photo, upload photo attachments directly to your posts and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.



      to hide adverts.
    3. Yamvip

      Yamvip Active Member

      Joined:
      March 11, 2006
      Messages:
      126
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Swanton, Ohio
      Year and Model:
      2002 XLT 4x4 4.0L FFV
      It could be the bearing or the rearend????
       
    4. thepotroast

      thepotroast Well-Known Member

      Joined:
      February 24, 2009
      Messages:
      1,094
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Asheville, NC
      Year and Model:
      3rd Gen EB 4x4 V8
      The rear diffs on the 3rd gen's are notoriously loud. There is a common occurrence of worn gears and a bad differential clutch pack in the 02-05's, so much so that Ford put out a TSB on it and replaced rear ends making the howling if the vehicle's were under warranty. They serviced and replaced my rear diff internals at 60k miles.

      However, a constant humming regardless of acceleration or speed sounds more like a bad bearing, whether it be a diff bearing or a wheel bearing at the hub assembly. The differential whine associated with worn gears and differential clutch packs usually occurs at certain intervals in speed, and goes away when you let off the gas or coast in neutral.

      I believe your issue is a bad bearing somewhere back there...whether it be in the differential itself, or at the wheel.

      A quick way to check the wheel bearings, is to jack up each side, and try to shake the wheel up, down or back and forth. There should be no play.
       
    5. gbranh

      gbranh New Member

      Joined:
      November 30, 2009
      Messages:
      28
      Likes Received:
      0
      Trophy Points:
      0
      Thanks, guys. I think it's a bearing, as well. I'm going to get it on my lift this weekend, and swap the rear tires while I'm at it, just to make sure the sound doesn't follow the tire. It's definitely coming from the right rear.

      I'll report back.

      Greg
       
    6. Fyrmn88

      Fyrmn88 New Member

      Joined:
      February 4, 2010
      Messages:
      12
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Ft Meade,Fl
      Year and Model:
      '02 XLT 4.6L 4X4
      I think I may have the same problem, only thing is the noise goes away when I let off the accelerator. Sounds like I have a knobby tire on the rear with all the whinning. So can it be the tranny, bearing or diff? Any help would be greatly apprecciated
       
    7. thepotroast

      thepotroast Well-Known Member

      Joined:
      February 24, 2009
      Messages:
      1,094
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Asheville, NC
      Year and Model:
      3rd Gen EB 4x4 V8
      Differential. Read my post above and it explains the difference between the symptoms. The whine is very common across the board, Ford put out a TSB on the issue and replaced the ring, pinion and diff clutch packs on Explorer's still under warranty under the TSB for it.
       
    8. gbranh

      gbranh New Member

      Joined:
      November 30, 2009
      Messages:
      28
      Likes Received:
      0
      Trophy Points:
      0
      ***Update***

      I put the truck up on my lift, and removed both rear tires. Visual inspection revealed nothing conclusive; both inner and outer CV joints looked clean. No play in the hubs when rocking tires in and out and back and forth. Rotating one tire (the other spinning the other direction, of course, didn't reveal anything, either. I then swapped the rear tires left-to-right, and "maybe" the sound seemed to move more to the center of the truck, but that could've been my imagination. I then played with rear tire pressure, to see if I could change the noise, and that didn't really seem to make a difference, either.

      I think at this point, I'll change the rear diff lube. Any suggestions on fluids, procedure, etc? I've changed the rear gear lube in Ford 8.8" solid axle Mustangs several times; is this the same? I assume I remove the rear diff cover, flush, and clean, RTV the cover, and reassemble, then fill by removing a fill plug somewhere?

      Greg
       
    9. mountaineer02

      mountaineer02 Member

      Joined:
      February 17, 2010
      Messages:
      84
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      SLC, UTAH
      Year and Model:
      2002 MONTAINEER
      I would also appreciate the advice asked by gbranh. I guess i could just read my haynes manual aswell. if its not under warranty, any thoughts on parts other then OEM?
       
    10. 9eye

      9eye New Member

      Joined:
      May 24, 2010
      Messages:
      1
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Kansas City, MO
      Year and Model:
      2002 Eddie Bauer
      I am gonna bet on bearings, i personally have 2 2002 explorers (a limited and eddie bauer). Between 100,000 and 130,000 miles i have had to chang all 8 bearings on both vehicles. Before realizing this was such an issue on these vehicles i left the humming noise as a loud diff as some above have noted. Eventually the rear right bearing on the eddie bauer overheated so badly it melted the cv boot right off the axle. The quick boot kit used to replace it was not a perfect fit so now my new project for the week will be replacing the axle assembly for that side that now knocks terribly when accelerating and decelerating, yay. Besides my own humble opinion in other forums i have done searching in it seems to be such a huge problem that people are crying for a recall. Personally they do last over 100,000 miles in most cases i have seen so i am not gonna cry for a recall but it does seem to be a very large scale problem as opposed to the differential. imho
       
    11. iBrent

      iBrent Member

      Joined:
      October 6, 2008
      Messages:
      68
      Likes Received:
      0
      Trophy Points:
      6
      City, State:
      Bradenton, FL
      Year and Model:
      2005 Eddie Bauer 4x4
      Wow, you got 100k+ out of your bearings? that's great. My '05 had to have new front bearings at 63k. I was tempted to buy OEM but if they only last 63k then maybe i'll have better luck with aftermarket. I went with Timken bearings from Rock Auto. Haven't had to do the rears yet (knock on wood).
       
    12. hoss_hanna

      hoss_hanna Active Member

      Joined:
      July 31, 2009
      Messages:
      247
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      ft. smith, ar
      Year and Model:
      91 4x4, 93 XL, 01 mountie
      the explorers have been plagued by bearing issues since the first gen in 91, if someone tells me they have noise from a wheel on an ex my knee jerk response is "check the wheel bearings" >.<
       
    13. jakedrew

      jakedrew Active Member

      Joined:
      August 9, 2009
      Messages:
      524
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      wisconsin
      Year and Model:
      04 xlt
      I had my rear diff make noise at 55k miles. I get up to about 55 mph and you could hear a humming, let off the gas it goes away, give it a little gas and you could hear it.

      Took it in (Extended warranty) and they couldnt hear it, but I told them I only hear it after about 10 miles/ fluid gets warmed up. So i took it up and down the freeway and had a tech come with me for a ride and whaa laa rear end making noise.

      All better now.

      It was a 1100$ job at ford, but i had a 100$ deductable :) so i got lucky. they put in a new ring and pinion and change to thicker fluid.

      Good luck.
       
    14. gbranh

      gbranh New Member

      Joined:
      November 30, 2009
      Messages:
      28
      Likes Received:
      0
      Trophy Points:
      0
      Fixed

      Turned out to be rear passenger side hub bearing. Had it fixed, good as new!

      Greg
       
    15. hoss_hanna

      hoss_hanna Active Member

      Joined:
      July 31, 2009
      Messages:
      247
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      ft. smith, ar
      Year and Model:
      91 4x4, 93 XL, 01 mountie
      so my knee jerk was right? lol
       
    16. gbranh

      gbranh New Member

      Joined:
      November 30, 2009
      Messages:
      28
      Likes Received:
      0
      Trophy Points:
      0
      Indeed it was! Thanks for the advice!

      Greg
       
    17. thepotroast

      thepotroast Well-Known Member

      Joined:
      February 24, 2009
      Messages:
      1,094
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Asheville, NC
      Year and Model:
      3rd Gen EB 4x4 V8
      Exactly as I had predicted in my initial response ;)
       
    18. Juandedios74

      Juandedios74 New Member

      Joined:
      May 12, 2010
      Messages:
      12
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Mulberry, FL
      Year and Model:
      2002 Explorer XLS
      Hello All,
      Nubie here and I also have an 02 Explorer XLS with 99,318K on it. Everything still factory on it and it too has developed several issues which I have worked on lil by lil to get all the lights off of the panel. My Explorer also makes the humming sound towards the rear of the truck once it reaches a certain speed. Yesterday after a trip 200 mile trip I parked the truck in my garage and noticed that the rear differential was lieaking oil from the bottom of the diff and alos noticed that the truck is making a jerking or stuttering I let off on the gas. I've read the post on this string and was wondering if anyone has an idea on how to repair/replace any of the kits on this truck. Pictures would be great as I'll work on it with my laptop next to me. Any help would be appreciated.
       
    19. DVRDOWN

      DVRDOWN Member

      Joined:
      September 7, 2006
      Messages:
      62
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      West Palm Beach, FL
      Year and Model:
      '02 XLT Flex Fuel 4x4
      Gbranh, did you replace the bearing yourself or have a mechanic do it? If you had it done, what did the job run you? I will be replacing my 4th, yes 4th, right rear bearing on my '02, as well as the left rear and really don't want to tackle the job myself in south florida heat.
       
    20. Gaff It

      Gaff It New Member

      Joined:
      March 15, 2009
      Messages:
      39
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Springfield PA
      Year and Model:
      2004 Eddie Bauer
      Gone through the rear diff hum now. Just had a rear axle seal replaced. Soon after, I hear the hum. Plan to take it back to make sure they put enough oil in after the seal replacement. If so, how long do I have before I am faced with a $1500 repair bill. Have 80,000 on the Ex now. It is great shape otherwise.
       
    21. CFieldAZ

      CFieldAZ New Member

      Joined:
      October 28, 2010
      Messages:
      7
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Chandler, AZ
      Year and Model:
      '03 Bauer
      any after market rear diff brands recommended?
       
    22. fordmanforever

      fordmanforever New Member

      Joined:
      November 8, 2010
      Messages:
      3
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Pittsburgh, PA
      Year and Model:
      2002 XLT 4DR
      What is the mileage cut off on getting Ford to do the TSB without out of cost expense??? Thanks guys
       
    23. -Strike-

      -Strike- Member

      Joined:
      October 5, 2010
      Messages:
      69
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Ontario, Canada
      Year and Model:
      04' Eddie Bauer V8
      I had the TSB done on my X a couple of years ago, costed me $100 for the warranty deductable. It appeared to fix the problem for about a year, now the hum is back, haha. I don't think they did it right. Last oil change I had it in for, they marked down the rear axle seals as leaking. I thought to myself.. didn't they just rebuild this? Shouldn't there be new seals in there? Hrm.. oh well. We'll see.
       
    24. fordmanforever

      fordmanforever New Member

      Joined:
      November 8, 2010
      Messages:
      3
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Pittsburgh, PA
      Year and Model:
      2002 XLT 4DR
      Wow that's sad that it's already damaged again. Do you know how many miles is to many to get them to pay the rest of the repair?
       
    25. The Rocky1

      The Rocky1 New Member

      Joined:
      September 18, 2015
      Messages:
      1
      Likes Received:
      0
      Trophy Points:
      0
      Year and Model:
      2002 Ford Explorer 4.0
      Rear differential, your pinion and seal guaranteed
       

    Share This Page









    We Support Our Troops!