Quote:
Originally Posted by Bull907
It does have a nv125. The rear wheels turn. Everything works perfect on the car it drives great but the front wheels have no power to them.
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Can you be more specific on why you think there is no power to the front? Spinning rear wheels throwing snow like a snowblower while the fronts just sit there? When stuck / when rolling? Something else?
It's a very simple system, as I mentioned above. If you know how a differential works, you can think of that NV125 transfer case as working just like that. The NV125 uses a planetary gearset which automatically produces a 68/32 torque split based on the radii of the rear/front contact points of the planetary gears.
As Qsilver7 provides in great detail, the smart part of the system then detects wheel slip (like ABS does, or traction control on a 2WD car) and modulates braking to the wheel that is slipping to stop the slip and allow torque to transfer to the other wheels that still have grip.
First thing I would do is to verify that everthing is good mechanically, so getting the wheels off the ground and confirming that things rotate as they should, coupling through the differentials and TC. If that all checks out, there may be something with the DSC.
Here's a good article that may help with the NV125 description. Sometimes some good pictures help a lot.
x5 transfer case tech article.pdf
EDIT - good article, but I now see that is not so much about the NV125. So look further if you want to see how the NV125 works.