I wanted to mention something as far as sealing the transfer case and transmission case halves.
At work, I frequently run into shaft seal issues with a certain brand of hydraulic motor. To replace the seal, the motor has to be disassembled. The really awesome part is that this manufacturer has chosen to not employ a traditional o-ring for sealing the case halves of the motor. Instead, the technician is expected to use a sealant on the cleaned, bare case halves. For this, I use Loctite 518. In using it, I have never
had a case seal failure, even when the boss was in my face to get the thing fixed and I didn't have time to fully clean the old stuff off. One of these motors even has stripped threads in a bolt hole that would be helping clamp the halves together. The 518 has demonstrated excellent chemical resistance, and in this application is subjected to operating pressures around 2000psi, as well as temperatures far exceeding "touchable."
When I learned I would be disassembling my G56, my first thought was to use my trusty Loctite 518 to seal it back up. When I actually got it apart, I noticed the dried stuff on the case halves looked identical to what I see when I tear those hydraulic motors apart. Later on, doing my transfer case (where I also decided to employ the 518) I found that Loctite 518 is actually specified in the FSM as an appropriate sealant
, along with "Mopar Gasket Maker" and "Mopar silicone adhesive/sealant." The Mopar silicone adhesive/sealant sounds a lot like RTV to me, which I'm sure would work if nothing more suitable was available. What I've read on Mopar Gasket Maker suggests that it and 518 are quite similar, in that they're both anaerobic sealants designed for use on machined aluminum flanges. That said I have no experience with Mopar Gasket Maker.
I recommend the 518 not only because of my experience with it, but it's also cheaper and should be much more easy to find than Mopar Gasket Maker. Anyone who carries Loctite products should be able to get it, if your local fastener supply store doesn't have it on the shelf. Zoro Tools, the online retailer who currently has the best price on Delvac Synthetic Transmission Fluid 50 (which you should be putting in your G56 instead of ATF, don't get me started on that) also has the best price I've found on Loctite 518.