Transfer Case: Harmonic Balancer or Not?

Agreed. I am having good results from adding density to the skid plate. But the harmonic vibration is still present above 50. I think I will need to add weight directly to the TC housing to eliminate the HV. Any ideas?

Did you ever solve this issue I’ve been having a harmonic vibration in mine as well 05, 42rle, Tom woods front Adam’s rear shaft, Advanced adapters sye, hp 30 front 44 rear regeared to 5.13 and ox lockers on both ends. Pinion angles are perfect and I’ve tried variations from +2 to -2. Changed wheels and tires. All to still have the pulsing vibes above 60ish. Curious if adding weights to your TCase made any improvement?
 
They added the balancer in 2003, so older cases don't have it.

I'm fairly certain you won't find anybody that can tell you the consequences of NOT using it, and many of us have installed slip yoke eliminators which eliminate any provision for using it.

But I can't help but consider that it cost Jeep money to buy the balancer and install it, and they don't just throw parts onto vehicles all willy nilly without having identified a need for said part. If I was in your position using a stock case and could use the balancer, I would keep it and put it on your new one.

I would like to add that my 2000 Sahara has the damper on the t-case, as well as the t-case off a 2000 Sport that I just bought for parts.