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  1. #1
    Active Member One Ring Kadomcbest's Avatar
    Join Date
    Apr 01 2018
    AZ Member #

    Possible centre diff issue?

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    I just took my car out camping, figured id have a little fun on the muddy road (clearly not my brightest idea). Usually im careful with how i bag my car and the road was flat enough and very slippery. My car is now making a rough grinding noise, almost like my driveshaft is making steady contact with my undercarriage (if i had to compare it to something) when i turn right and engage the clutch to accelerate, this continues throughout the first gear until im straightened out. I believe the sound is coming from my centre diff but i could be wrong. The sharper i turn, the worst the grinding is. The sound doesnt happen at higher speeds and i have noticed no difference in the side to side pull of the car when i do accelerate. No clunking from my cv either. I apologize if theres already a thread to this, i couldnt find the exact thing that im experiencing. Thanks for the help.

  2. #2
    Senior Member Four Rings VinnysS4's Avatar
    Join Date
    Nov 12 2015
    AZ Member #

    Have you looked underneath it to see if anything visually appears out of place?

    Sent from my SM-N920V using Tapatalk
    1997 VW GTI VR6 (sold), 2003 Audi RS6 (sold), 2010 Audi A4 2.0T (RIP Totaled on 11/2/2015 ) 2005.5 Audi S4

    My build log

    Texpoops "Correct, but a half inch difference isnít going to accelerate wear by much. Iím sure the front dips that much with a fatty in the front"

  3. #3
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    Erie, Pennsylvania

    You smashed your exhaust pipe into the heat shield that sits in between the exhaust pipe and the driveshaft. So now the heat shield is rubbing on the driveshaft.

    Source: I have a somewhat upsized 2.5" stainless exhaust that I got hung very tight to the bottom of the car (for ground clearance purposes). At the tightest point there is about a 1" gap between the exhaust pipe and the driveshaft. This is right at the front of the rear differential. If I bottom out on something, the exhaust will push up and bend the heat shield. After this, the heat shield will rub on the differential input cup and/or driveshaft rear CV joint, especially in Reverse or Decel because it pushes the diff nose downward. I just have to get under there and tweak the shield a little and it's good to go.
    ^Don't listen to this guy, he's not even a mechanic.
    2001 Laser Red A4 1.8TQM, 5-Speed Swapped, 4.11 Final Drive, APR 93, R8 coil packs, Labree HFC & DP, 2.5" Exhaust, ST Coilovers, 034 RSB, A8 Brakes Front & Rear, 18" RS4 Reps
    2006 Passion Red Volvo V50 T5 AWD 6MT
    "You need to know what you are doing...Its like a rainbow jungle in there." - Redline380


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