Weird Drivetrain clunk (328xi/6mt)

k_mann · 10-16-2017, 11:51 AM

Hey all,

So with my 07 e92 328xi 6mt, I've had this strange clunk/thunk sound when slowing. It happens when I slow and get to the 15-20mph range. It sounds like something disengaging. Its mainly a big clunk followed by a couple smaller ones (think echoing effect). Or if driving in first around 10mph it clunks back in forth.

Stealership and my local indy said its the transfer case. So I pulled the front drive shaft and the noise has vanished, is it safe to assume they're correct? I have a t-case fluid change kit on the way as I've heard that this has solved the issue. But I'm not sure if I should just save the $50 on the fluid and put it in a low mileage t-case from a salvage yard. Any one else experienced this?

JETmn · 10-16-2017, 03:27 PM

There really isn't much to these transfer cases. I am pulling mine this weekend hopefully and doing a rebuild. I found my front output bearing is going bad (102k miles on it). Cobra Transmission has all of the components and they are pretty cheap. There is a youtube showing the rebuilding of a ATC300 or 400. Ours is the 300.

k_mann · 10-17-2017, 10:40 AM

Quote:

Originally Posted by JETmn

There really isn't much to these transfer cases. I am pulling mine this weekend hopefully and doing a rebuild. I found my front output bearing is going bad (102k miles on it). Cobra Transmission has all of the components and they are pretty cheap. There is a youtube showing the rebuilding of a ATC300 or 400. Ours is the 300.

I like the sound of a rebuild! In for results!

I'm also thinking of putting liquid suspension's 60a polyurethane in the t-case mount (which is where I suspect most of the driveline slack exists). But at the same time I don't want this to speed up t-case wear.

panchofarrera · 10-27-2017, 10:01 AM

Were you able to fix this? How hard was this DIY?

10-16-2017, 11:51 AM	#1
k_mann Lieutenant 372 Rep 445 Posts Drives: 2018 M2 Join Date: Mar 2016 Location: Kansas City iTrader: (0) Garage List 2018 BMW M2 [10.00]	Weird Drivetrain clunk (328xi/6mt) Hey all, So with my 07 e92 328xi 6mt, I've had this strange clunk/thunk sound when slowing. It happens when I slow and get to the 15-20mph range. It sounds like something disengaging. Its mainly a big clunk followed by a couple smaller ones (think echoing effect). Or if driving in first around 10mph it clunks back in forth. Stealership and my local indy said its the transfer case. So I pulled the front drive shaft and the noise has vanished, is it safe to assume they're correct? I have a t-case fluid change kit on the way as I've heard that this has solved the issue. But I'm not sure if I should just save the $50 on the fluid and put it in a low mileage t-case from a salvage yard. Any one else experienced this?
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10-16-2017, 03:27 PM	#2
JETmn Lieutenant Colonel 245 Rep 1,595 Posts Drives: 2011 335i xDrive Msport Join Date: Apr 2013 Location: Orlando iTrader: (0) Garage List 2011 335Xi [0.00]	There really isn't much to these transfer cases. I am pulling mine this weekend hopefully and doing a rebuild. I found my front output bearing is going bad (102k miles on it). Cobra Transmission has all of the components and they are pretty cheap. There is a youtube showing the rebuilding of a ATC300 or 400. Ours is the 300. __________________ 2011 335Xi 6AT - VRSF catless DP - VRSF 7" FMIC with turbo inlet pipe - VRSF chargepipe - Pure Stage 1 turbo - JB4 - E30 - xHP Stage 3 - Strongflex tension bushings - Whiteline RSFB - UUC rear swaybar
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10-27-2017, 10:01 AM	#4
panchofarrera Private 27 Rep 63 Posts Drives: 2008 BMW 335xi coupe Join Date: Oct 2017 Location: Lafayette LA iTrader: (0)	Were you able to fix this? How hard was this DIY?
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