I bought a np247 transfer case for a Jeep Grand Cherockee from Monster once. Never again.
The viscous coupler (awd) was slipping. But didn't notice it till winter came around. I think it was slipping from the beginning. My fault for not finding the problem right away and for not raising the issue with Monster.
But regardless of my faults in detecting and reporting the issue, the bottom line is it was faulty and should not have been after spending a $1200.

Items that require quite bit of labor to install had better damn well work right every time.

Shawn