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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Transfer Case Mount???



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      10-26-2016, 06:56 PM   #1
toicy4ya
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Transfer Case Mount???

Sup Guys,

Anyone know what are the signs of a bad transfer case mount? Anyone ever replace one?

I noticed when driving and coming to a quick stop my car makes a certain "kaplunk" sound. It feels like a bad motor mount, but they checked out fine.
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      10-26-2016, 10:10 PM   #2
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The transfer case doesn't have a mount per se - it's attached/mounted to the back of the transmission, which is supported by the rear engine/transmission mount.

You should check the play in the center driveshaft support, the guibo, the rear u-joint, etc.
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      10-27-2016, 08:16 AM   #3
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Is there any way to tell if it's bad while driving?
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      10-27-2016, 11:05 AM   #4
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Quote:
Originally Posted by toicy4ya View Post
Is there any way to tell if it's bad while driving?
Mount a GoPro or another action camera to the transfer case cross member and see if you can see anything with significant play or movement.
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      10-30-2016, 06:51 PM   #5
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Quote:
Originally Posted by floydarogers View Post
The transfer case doesn't have a mount per se - it's attached/mounted to the back of the transmission, which is supported by the rear engine/transmission mount.

You should check the play in the center driveshaft support, the guibo, the rear u-joint, etc.
Transfer case has a mount. On xi (xdrive) the mounts are the two engine mounts on engine and then the transfer case mount. On xi transmission itself has no mount since transfer case has it.

330xi:
http://www.realoem.com/bmw/enUS/part...MW-330xi&mg=22

330i :
http://www.realoem.com/bmw/enUS/part...BMW-330i&mg=22

If car is lifted it can be diagnosed for extra play with a pry bar and visual inspection.
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      12-11-2016, 07:19 PM   #6
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I just bought new motor mounts (034 Motorsports solid rubber 50A) and a new OEM transfer case mount, as preventative maintenance at 55k miles.

The transmission / transfer case bushing should be upgraded at the same time as the motor mounts, but in our case (xDrive), there are no aftermarket, low-compliance bushings available. I plan to fill the voids in the stock TC bushing (45A with large voids to minimize NVH) with 65A poly fill (3M Window Weld) to reduce the compliance, resulting in a firmer drivetrain.

Will update in a separate post for results.
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      12-11-2016, 10:43 PM   #7
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Quote:
Originally Posted by tetsuo111 View Post
I just bought new motor mounts (034 Motorsports solid rubber 50A) and a new OEM transfer case mount, as preventative maintenance at 55k miles.

The transmission / transfer case bushing should be upgraded at the same time as the motor mounts, but in our case (xDrive), there are no aftermarket, low-compliance bushings available. I plan to fill the voids in the stock TC bushing (45A with large voids to minimize NVH) with 65A poly fill (3M Window Weld) to reduce the compliance, resulting in a firmer drivetrain.

Will update in a separate post for results.
Someone has gone this route and I think he said the fill he used was too still and had horrible nvh. Check the xi subforum.

Let me know how yours turns out. I've been toying with the idea of making mounts for xi people by creating a cast of the existing mount and then doing a new mount with harder durometer rubber with the metal insert jigged to the correct position, but I have more good ideas than I do spare time lately.
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      12-12-2016, 04:49 PM   #8
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Quote:
Originally Posted by mikes4 View Post
Someone has gone this route and I think he said the fill he used was too still and had horrible nvh. Check the xi subforum.

Let me know how yours turns out. I've been toying with the idea of making mounts for xi people by creating a cast of the existing mount and then doing a new mount with harder durometer rubber with the metal insert jigged to the correct position, but I have more good ideas than I do spare time lately.
Mike, I don't spend enough time in the xDrive forum as I ought to. Thanks for this.

My understanding is that of the entire drivetrain, the transmission / transfer case bushings have the greatest potential for NVH. I've removed compliance throughout my suspension, including solid RSBs, without any negatives on NVH. The Turner Delrin diff bushings are the only low-compliance mod that resulted in an audible and somewhat distracting "whining" sound. I actually enjoy it, but most of my passengers don't.

I'll search for that reference. I'm not surprised someone has tried this, although I thought I might be first. I might find a happy compromise by only partialling filling those voids, say 1/2 or 3/4 full. I plan to use 3M Window Weld as the poly filling. The stiffness spec is 65A, compared with OEM = 45A, and BMW Group N rubber at 70A rubber. The numbers seem "reasonable" but only a test will reveal success or failure.
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      12-13-2016, 11:40 PM   #9
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Quote:
Originally Posted by tetsuo111 View Post
Quote:
Originally Posted by mikes4 View Post
Someone has gone this route and I think he said the fill he used was too still and had horrible nvh. Check the xi subforum.

Let me know how yours turns out. I've been toying with the idea of making mounts for xi people by creating a cast of the existing mount and then doing a new mount with harder durometer rubber with the metal insert jigged to the correct position, but I have more good ideas than I do spare time lately.
Mike, I don't spend enough time in the xDrive forum as I ought to. Thanks for this.

My understanding is that of the entire drivetrain, the transmission / transfer case bushings have the greatest potential for NVH. I've removed compliance throughout my suspension, including solid RSBs, without any negatives on NVH. The Turner Delrin diff bushings are the only low-compliance mod that resulted in an audible and somewhat distracting "whining" sound. I actually enjoy it, but most of my passengers don't.

I'll search for that reference. I'm not surprised someone has tried this, although I thought I might be first. I might find a happy compromise by only partialling filling those voids, say 1/2 or 3/4 full. I plan to use 3M Window Weld as the poly filling. The stiffness spec is 65A, compared with OEM = 45A, and BMW Group N rubber at 70A rubber. The numbers seem "reasonable" but only a test will reveal success or failure.
Yes someone did try it and said the nvh was to much for him
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