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Thread: Rumble/grinding noise in the rear??

  1. #1
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    Rumble/grinding noise in the rear??

    What's up guys! I have a 2001 Ford Excursion 7.3 4x4 that I noticed had some rumbling and/or grinding type noise towards the rear of the truck during....it seems like...left hand turns and quickly disapates as the truck straightens out! It also sounds really bad in reverse going on a very slight inclined driveway. I noticed another post a whike back that suggested the rear diff fluid be changed which I did with a synthetic fluid and 4oz of friction modifier.

    What do you all think? Is 4oz of the friction modifier enough? what else might I look into. If this helps at all or even if its a related problem, The truck pulls to the right bad and the tire wear is horrible!! The previous owner hardly maintained this truck and i'm playing catch up now!

    Thanks for the help!!

  2. #2
    SoCAPS Moderator weweld's Avatar
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    U joints or parking brake brake shoes wore out ??
    GENE

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  3. #3
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    I will check both the u-joints and brakes later today and report back! Thanks for the direction! Its greatly appreciated!

  4. #4
    SoCAPS Member F350MudBogger's Avatar
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    I would check the rear hub bearings on the side that pulls, A good indicator is the parking brake will be saturated in diff fluid from a seal failure if the bearing is work I waould assume it would cause a seal failure as well?

    2013 VW Passat TDI
    2006 VW Jetta TDI
    2006 F250 Lariat 4x4 SB CC 6.0 Arizona Bulletproof EGR cooler & All Aluminum Radiator Magnaflow exhaust 4" lift SCT X3 Diesel site coolant filter Blue Spring & Banjo Bolt upgrades h11 headstuds UCLA Softball powered!
    2001 Excursion Ltd 4x4 7.3 Oxford White Magnaflow 4" exhaust Diablosport tuner 4" lift 33" BFG's
    2001 Honda XR650L

    2009 Ford F250 Lariat 4x4 LB CC (Sold was a bad apple)
    2005 Ford Excursion Eddie B (Sold I kick myself in the rear for doing this)
    2003 Ford F350 CC LB 4x4 40' MTRS 12.5" lift (Sold -Too big)

  5. #5
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    I did a full break inspection finding nothing! They all are in good shape. The passenger side rear parking break pad was saturated in diff fluid due to a bad seal. I throughly cleaned and inspected the bearings which looked great. I replaced the seal, topped off the diff fluid and added 4 more oz of friction modifier for a total of 8oz. I also replaced all four front shocks which were shot! I rotated the tires but the vehicle still pulls hard to the right and has a slight rumble in reverse. Ford said perhaps rear diff clutches may need to be replaced?? I know nothing about that! What you all think?

  6. #6
    SoCAPS Member F350MudBogger's Avatar
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    I would say the diff clutches usually just wear out and the limited slip doesn't limit anymore, as the clutches are worn-out, I've never heard of any noise unless maybe the pinion bearing is going out. Have you jacked up both sides of the rear axle and spin the wheels freely with the trans in neutral to see if there are any strange noises, You should be able to pin point bearing noises or drive shaft u-joint noises. Front wheels chocked on a level surface of couse! And I'd get a helper to hold one side while you spin the other? I had a front drive shaft u-joint go bad once and was told I had a bad transfer-case by the dealer & an independent shop!

    2013 VW Passat TDI
    2006 VW Jetta TDI
    2006 F250 Lariat 4x4 SB CC 6.0 Arizona Bulletproof EGR cooler & All Aluminum Radiator Magnaflow exhaust 4" lift SCT X3 Diesel site coolant filter Blue Spring & Banjo Bolt upgrades h11 headstuds UCLA Softball powered!
    2001 Excursion Ltd 4x4 7.3 Oxford White Magnaflow 4" exhaust Diablosport tuner 4" lift 33" BFG's
    2001 Honda XR650L

    2009 Ford F250 Lariat 4x4 LB CC (Sold was a bad apple)
    2005 Ford Excursion Eddie B (Sold I kick myself in the rear for doing this)
    2003 Ford F350 CC LB 4x4 40' MTRS 12.5" lift (Sold -Too big)

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