If your u joint goes bad it will not save your extension housing. If you have harmonic vibration going on in the transfer case; it will not save you.
What it will do is keep broken parts from falling to the ground when you shatter your transfer case. We saw this happen on Casper back in '08 while Pat was making a pass.
I figured he cracked it due to other "circumstances", not a bent driveshaft or broken Ujoint. My apologies.
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