We've got an '03 Duramax FWD. Just went out in the snow(on road) and the thing started banging or thumping in the front end while engaged in four wheel high OR low. We made it home in 2WD but need to go out again soon. I went under the truck and don't see anything obvious. Driveshafts seem ok etc. Any ideas? thanks, Bob I think it is a NVG 263 case. push button type.

---AutoMerged DoublePost---

Could it be the front axle actuator engaging/disengaging rapidly?

 

Hey dad,

I've been scratching my head, and still not coming up with anything... I might come by tomorrow an we can take it for a ride.