Michael,
I have spent a lot of time on the web after you posted this to see what is important about hub/sealed bearing replacement and why the factory sealed bearing assy fails. One thing is the close proximity of the bearings. A wider splay of bearings on the spindle has a better chance at survival, especially when big tires and wide, less backspaced wheels are involved. The other thing is maintainability. All the aftermarket kits are servicable. The thing that got me thinking about your choice is that the hubs don't stick out as far as the Dynatrac and others. Some say the long stickout is a good thing as the bearings are placed farther apart reducing the leverage of shock loading. The other thing I like about the Spyn-tec's is the weather proofing, or weather resisting package.
the others are open/open to water and dirt. Spyntec seems to be the highest quality, and most researched. The other aspect is price. Dynatrac's can cost up to $2500. Spyntec can cost about $1K less. I've written Spyntec to see what they say about the bearings-too-close issue, and maybe it's just a factor of not using Warn Hubs.
I'm about ready to drop the hammer with these, so if there is any other info besides the above, say it now or forever hold your peace. 8<)
In addition, I have been exploring the use of Top Gun Customz 5-leaf spring pack that replaces that dumb thick bottom overload spring with 5 thin leaves and gives a 2" lift, and more flex. The hanger here is I use two sets of upper overloads (both one ton versions) and Stable Loads already, so I'm trying to get info on any clearance or operational issues before i spring for them.
I've been under the influence of the flu the last few days and have spent way too much bleary-eyed time on the web looking at ways to upgrade my Dodge for the bush. Another thing that caught my eye was the selectable OX locker available for the Dodge front Dana 60. It's kind of the manual transmission of locking diffs: cable operated. Just like the Unimogs.
Another question for you: did you replace the two piece pass. side axle shaft with a one piece? If not, did you put the coupler in permanent lock?
jefe