2005 BMW X3 TRANSFER CASE REBUILD -DIY

[Natezo]

Originally Posted by dachtera

Hello Sean - I am trying to troubleshoot my ATC400, and wondering should the assembly at timepoint 3:59 allow the input shaft from the servomotor to rotate a full 360, or should there be some resistance from the clutchpack limiting the rotation? I've replace my servomotor and ECU, get the TC still will not calibrate. Debating if I'm going to drop the TC or just send the car down the road. Great video!

I may have similar issue...did you ever resolve yours?

[dachtera]

Originally Posted by Natezo

I may have similar issue...did you ever resolve yours?

Turns out my whole clutch pack inside was shredded. I was lucky enough to find an X3 on FB Marketplace being parted out, and picked up that TC for $100.. Swapped it out, calibrated stuff with ISTA and all was great! Took longer to drop the exhaust and drive line than the actual TC swap.

Here's a vid I did on the specific instance, so hopefully some help..

https://youtu.be/0-xZ3-8hh8Q?t=583

[Natezo]

Originally Posted by dachtera

Turns out my whole clutch pack inside was shredded. I was lucky enough to find an X3 on FB Marketplace being parted out, and picked up that TC for $100.. Swapped it out, calibrated stuff with ISTA and all was great! Took longer to drop the exhaust and drive line than the actual TC swap.

Here's a vid I did on the specific instance, so hopefully some help..

https://youtu.be/0-xZ3-8hh8Q?t=583

I don’t have a free wheeling shaft where the actuator connects, did you have a force too high code? I can turn the shaft with my hand and there is some resistance it’s not significant but it’s not nothing either.

[dachtera]

Originally Posted by Natezo

I don’t have a free wheeling shaft where the actuator connects, did you have a force too high code? I can turn the shaft with my hand and there is some resistance it’s not significant but it’s not nothing either.

Sorry for the delay.. - I had no codes at all on the dash, which is what was really confusing in my case, as my issues didn't match up with the standard problems owners encounter. I had slight resistance, but nothing huge. Every once in awhile, it would seem to catch and be hard to turn, but sooner or later, it would free itself and spin again pretty freely.

When I put in the new [ to me ] transfer case, I was not able to spin that input shaft, I could maybe put a very small turn on it by hand before it simply refused to budge.

[cn90]

For those of you with TC problem...

What was the mileage when the transfer case went bad?

What were the symptoms?

[cn90]

My friend has a 2004 X3 2.5i auto with 165K, well-maintained.

Today the noise is nasty somewhere near the transfer case when driving at 20-30 mph, especially when braking.
Front driveshaft looks good.
Front axles look good.

Where does everyone buy your TC these days?
New is > $2900 at dealer for PN 27103455133!

[cn90]

Can anyone educate me the difference in symptoms of: bad plastic gear vs a kaput transfer case (bad chain, bearing and/or clutch)?