Irish Subaru Drivers Club Forum - Powered by vBulletin

#

Results 1 to 11 of 11

Thread: Rear Diff Grinding Noise. Car:GC8 '99 Turbo 2000.

  1. #1
    Full ISDC Club Member
    Join Date
    Apr 2017
    Location
    Dublin
    Posts
    14
    Thanks
    5
    Thanked 10 Times in 3 Posts
    Rides
    1
    Rep Power
    0

    Rear Diff Grinding Noise. Car:GC8 '99 Turbo 2000.

    Guys,

    Seeking advice on the best course of action to repair the rear diff on my car

    -----------------------
    Problem Description:
    -----------------------
    Audible grinding noise from rear diff, it sounds like a bushing "type" noise to my untrained ear. It has a cadence to it with the rotation of the wheel. Local garage put the car on the lift and with the car in drive and wheels turning it is obvious that the noise it coming from the diff, hard to be specific but sounds like the front of the diff, where the drive shaft enters.

    -------------------------
    Recent Repair History:
    -------------------------
    19th June 2018: Near Side Rear wheel bearing worn, grinding audible when driving. Local Subaru garage replaced, the replacement was reported to be difficult, it was not possible to press the bushing from the hub, the driveshaft and hub were too badly corroded. I gave them permission to proceed with replacement of rear shaft, hub and bearing.


    Q1. Ye guys know what spec rear diff is in my car?
    Q2. Can the bearings be replaced independent of the diff? or must the whole assy be replaced?
    Q3. Can a reliable rear diff be bought from a dismantlers yard or is the risk to high the diff will be moisture/water damaged?
    Q4. What is the most economical approach, buy and replace the complete diff? or disassemble the existing diff, replace bad
    components and reassemble & test? Would the garage man hours involved make this more expensive than a straight swap?
    Q5. It is an unhappy coincidence that this failure follows soon after the N/S/R bearing/hub/driveshaft. What do ye guys think about
    that? Did one thing lead to another?

    ----------
    Car Spec
    ----------
    Model: GC8KD3 Impreza Turbo 2000, Irish Model. .
    Year: '99
    ODO: 165K
    Engine Mods: None


    FYI:
    Attached image of identification stamps on the underside of the diff. This stamp may mean something to somebody.

    "814".... [unsure about this one, it's very faint, hard to read"
    "8Z"
    "KN9"



    Thanks & Regards,
    Ciaran20180727_200832.jpg
    Last edited by CMX70; 28-07-2018 at 00:08. Reason: Attached image of diff

  2. #2
    Member Number 2766
    ISDC Club Treasurer
    scoobysub's Avatar
    Join Date
    Nov 2008
    Location
    kilkenny
    Posts
    12,001
    Thanks
    2,744
    Thanked 2,582 Times in 1,630 Posts
    Rides
    1
    Rep Power
    10
    Hard to tell without looking at the car . But did the grinding noise go away after wheel bearing was done .

    i sounds like the Front propshaft bearing on the rear diff if your sure the noise is coming from there .
    Cost wise would be cheaper swap the differ over unless you can do most of the work yourself
    colin, richard, bertie, frank, gone but not forgotten.

    Peter marks account Reopened in Style!!!

  3. #3
    Petrolheads
    Join Date
    Aug 2017
    Posts
    390
    Thanks
    320
    Thanked 309 Times in 152 Posts
    Rides
    0
    Rep Power
    5
    It was the spider gears in my diff that went. I got a spare diff with a different final drive and swapped the spider gears keeping my own crown and pinion. First step would be to pull the diff and see what the issue is - I have a good 4.11 crown and pinion if they are your problem, other than that you could just get a replacement diff - bear in mind that backlash etc need to be set correctly

  4. #4
    Full ISDC Club Member
    Join Date
    Apr 2017
    Location
    Dublin
    Posts
    14
    Thanks
    5
    Thanked 10 Times in 3 Posts
    Rides
    1
    Rep Power
    0

    Rear diff replaced, problem unchanged.

    Guys,

    A replacement diff was installed yesterday but the problem remains, I have the original diff on the bench at home and the movement by hand feels frictionless and smooth. What is the level of diagnostics required to be sure of the next steps? Is it basically using the human ear to track the source of the noise or is there further technical actions that can be performed to isolate the source of the grinding noise? The next proposed step is gearbox bearings swap, cost = 884.00 [replace clutch at same time]

    Ciaran

  5. #5
    Petrolheads
    Join Date
    Aug 2017
    Posts
    390
    Thanks
    320
    Thanked 309 Times in 152 Posts
    Rides
    0
    Rep Power
    5
    I’d rule out the wheel bearings first, they’re common enough to give issues

  6. #6
    Full ISDC Club Member BazGF8's Avatar
    Join Date
    Feb 2008
    Location
    Dublin
    Posts
    6,267
    Thanks
    387
    Thanked 390 Times in 229 Posts
    Rides
    0
    Rep Power
    20
    What diff bushes are in the car ?
    V4 Sti Wagon

  7. #7
    Sunday Drivers
    Join Date
    Apr 2017
    Posts
    51
    Thanks
    1
    Thanked 13 Times in 5 Posts
    Rides
    0
    Rep Power
    2
    Im after getting a grinding/scraping from the rear since changing rear discs pads handbrake shoes im putting it down to all bedding in!? Have any of these been replaced in yours lately?

  8. #8
    Petrolheads
    Join Date
    Aug 2017
    Posts
    390
    Thanks
    320
    Thanked 309 Times in 152 Posts
    Rides
    0
    Rep Power
    5
    Quote Originally Posted by Aaronh View Post
    Im after getting a grinding/scraping from the rear since changing rear discs pads handbrake shoes im putting it down to all bedding in!? Have any of these been replaced in yours lately?
    Had the same, very common with aftermarket discs apparently, small lip that needs to be ground out - have a google on nasioc

  9. #9
    Member Number 161
    Full ISDC Members 2015
    keith dublin's Avatar
    Join Date
    Oct 2006
    Location
    Dublin
    Posts
    17,316
    Thanks
    753
    Thanked 2,833 Times in 2,034 Posts
    Rides
    0
    Rep Power
    57
    Get it to a good garage who know what that are at ...probably save you in the long run
    IT TOOK ME FOOKING 3 YEARS TO WORK OUT HOW TO PUT THIS SMALL BIT OF TEXT HERE!!!!!

  10. #10
    Full ISDC Club Member BazGF8's Avatar
    Join Date
    Feb 2008
    Location
    Dublin
    Posts
    6,267
    Thanks
    387
    Thanked 390 Times in 229 Posts
    Rides
    0
    Rep Power
    20
    Yeah the handbrake shoe lip on the disc is rubbing the back plate , very common.
    A specialist will usually offer to machine 2-3mm off for an extra fee .
    It’s not dangerous but obviously needs doing
    V4 Sti Wagon

  11. #11
    Member Number 16 davelegacy's Avatar
    Join Date
    Jul 2006
    Location
    Dublin
    Posts
    13,751
    Thanks
    339
    Thanked 552 Times in 418 Posts
    Rides
    0
    Rep Power
    31
    Yes.

    We insist if we are fitting rear discs that allow approval fir rear disc lip to be machined.


    If we are supplying only. We highly advise you get it done.

    Let me know if we can be of help to you on sorting

    Sent from my SM-N910T using Tapatalk

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •