| 03-23-2019, 09:35 AM | #1 |
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Hello,
Anyone else experience a thud/clunk from the rear end, when driving aggressively in 3/4 gear, with the throttle response and trans response dialed up, coming completely off and on the throttle aggressively? Owner manual says drivetrain noise is normal due to torque load/unload. Inspected the diff bolts and bushing, everything seems to be fine. Car is a 2016 Competition with 20k miles CPO with extended warranty. My Indy BMW tech said it was normal and not to worry about it. It definitely sounds like some play in between the bushing and bushing housing. Not sure if that is by design or not. Your time is greatly appreciated! JB |
| 03-23-2019, 10:25 AM | #2 |
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Second Lieutenant
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I had this as well, recently. It was super easy to reproduce. From a dead stop, put car in drive, hit the gas with some urgency, clunk. Then stop, go in to reverse, gas again, clunk. It was one of the three rubber bushings on the diff mount like you said.
So I replaced all three bushings. It was...expensive at the dealer, $574 for parts and $1395 for labor, got a $294 discount... I'd tell you to hit up allmotor_2000 for his custom reinforced mounts and have a local shop do it. They gotta drop the diff and dealer labor is insane...
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2021 Brands Hatch Grey M5 Competition
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BeachM5nster273.50 |
| 03-29-2019, 03:32 PM | #4 |
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Take a look at this thread. Same issue and solution. SI B33 01 13.
https://f10.m5post.com/forums/showthread.php?t=1473971 |
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JimBob0047269.50 |
| 03-29-2019, 03:36 PM | #5 | |
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| 03-29-2019, 04:44 PM | #6 |
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Solid diff mount from allmotor_2000 did the trick for me and now I can launch.
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14 M6 Sakhir Coupe | RK Autowerks Built Motor | G25-660 | Snow Performance Meth | RK DP | 4mm bored throttle bodies | SSP-X | SSP Trans Pan | RK Billet Diff Mount | DSS Axles | Rkautowerks carbon charge pipes | CSF Intercoolers |Akro exhaust | Gapped Plugs |RK intakes | 900whp/930wtq
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| 04-01-2019, 10:59 AM | #7 | |
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F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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| 04-01-2019, 11:00 AM | #8 | |
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F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph
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| 04-01-2019, 03:45 PM | #9 | |
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33-14-2-284-039 Adapter, Rear 33-17-2-284-474 Adapter, Front Couple of bolts "Replace front diff mount bracket/plate and rear diff mount bracket" Parts: $570 Labor: $1395 By the time I put any real thought in to it and realized I should have just bought your mounts and had a different shop do it, I was already committed and the repair was in progress. I have on-board video from the car while it was in the shop--whatever they did, they took a VERY long time to get it done. That guy spent hours on the car.
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| 04-01-2019, 07:19 PM | #10 | ||
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Dealership took the car in, took the rear end apart, inspected everything and re-torqued everything. Said everything was fine. To be clear it's more of a thud than a clunk. Could it just be the sound of DCT clutch engaging/disengaging? It only happens when I have throttle response on sport plus, trans in S, trans shift response 3 and I'm coming on the throttle aggressively after completely coming off the throttle. |
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