f the weight of the rubicrawler was an issue, a smaller weight anywhere near the transfer case will probably shift the vibes, especially if it is hung outboard in some fashion like on the side. If I was looking for a place to stick a weight I'd probably attach it to the rear side of the transfer case opposite the front yoke.
Balance wheels on the rear transfer case output did randomly appear on TJs and newer Jeeps did get a totally different front shaft design. These things might point to a more difficult to solve resonance issue especially considering Jeep is now going to be offering 4.88 gears for the first time only after including a disconnect for the front shaft from the factory. It all could just be coincidence.
Yeah. Key to point out that it didn't get rid of it entirely for him, it just got it to where it was smooth with the front shaft out and cleared the way for hubs to fix it. If it was a matter of rigidity or the resonant frequency of the powertrain assembly, I think it would have gone away entirely, but the fact that it just made it so it took both shafts to cause it instead of just one is what makes me think it's just the extra mass reducing the amplitude of the vibration in the powertrain assembly before it hits the frame and tub. I'll have to crawl under there and spend some time brainstorming on the best way to attach weight to the transfer case. Mine is barely more than 1 pound so I don't think it'll do anything there. Also the mounting needs to be pretty rigid so the transfer case can't vibrate within the mount while the extra mass hangs stationary in space. I might rig something up out of angle iron to mount to two of the case half bolts and bolt weight onto that so I can tinker with the amounts.
Last edited: