[ir655]

Just out of curiousity, what are the wheel/tire size being run on the car? I think BMW allows max 1% difference in circumference between front and rear axle on xdrive F-series. The higher the difference the faster the clutch packs burn up in the transfercase.

[kwork]

Thank you for reply all

i thnik you have to change transfercase i add the TSB for vtg please check this one

regards

Yes, I already checked this TSB.
No problems.

Just out of curiousity, what are the wheel/tire size being run on the car? I think BMW allows max 1% difference in circumference between front and rear axle on xdrive F-series. The higher the difference the faster the clutch packs burn up in the transfercase.

Yes, it is good question.
But I never change original tire size.
I changed the tires one time.

I want to know which problem Mechanical or electronic.
It is possible.
VTG is used one,transfer clutch is don’t see inside.
Hmmmmmm, it is problems.

Thank you all.


Best regards

[atomantmk]

In ISTA are 2 options, Repair and calibration!
Do first Repair and after that calibration...

[kwork]

In ISTA are 2 options, Repair and calibration!
Do first Repair and after that calibration...

Oh, I didn’t try that.
OK, Will try that for both modules.

Let you know that result.

Thank you.
Best Regards

[bmchicago]

end of transmission service life reached = worn out clutches.

Thank you for reply,

Yes, I know it.
But 42000km is too fast.
It is hard to think.

Anyone have experience?

Best Regards

BMW is reliable. This statement is hard to think too?

[stecom90]

Just out of curiousity, what are the wheel/tire size being run on the car? I think BMW allows max 1% difference in circumference between front and rear axle on xdrive F-series. The higher the difference the faster the clutch packs burn up in the transfercase.

I confirm, just fitting non-runflat tires damaged my transfer box.  After an oil change and ista calibration, it was better for a few days but I had to have the transfer box renovated, mechanical wear.  Do you feel jerks while driving ?

[kwork]

Thank you for reply.

[/quote]

BMW is reliable. This statement is hard to think too?
[/quote]
I think so.but not 100%.

Just out of curiousity, what are the wheel/tire size being run on the car? I think BMW allows max 1% difference in circumference between front and rear axle on xdrive F-series. The higher the difference the faster the clutch packs burn up in the transfercase.

I confirm, just fitting non-runflat tires damaged my transfer box.  After an oil change and ista calibration, it was better for a few days but I had to have the transfer box renovated, mechanical wear.  Do you feel jerks while driving ?

Oh really?
I used non runflat tire now.
It is possible of mechanical trouble.
When I am driving no judder,no jerk,no vibration. It is normal.

Thank you for advice.

Best Regards

[kwork]

Hello all,

OK, I decided to repair for clutch disc in transfer box.
original VTG unit was not work inside motor. unit was dead??
It broke because the clutch was too low and too much load was applied???

and about "USED"VTG unit
I thought that the clutch could not be calibrated because it was out of the applicable range.

anyway,
Thank you so much for many advice give to me.

I will report the results when the repair is complete.

Best Regards