1. Dynatrac housings can run spicer gears, throw some 3.54's in and you are good to go (and you can get actual spicer gears!)
2. The VAST majority of people who are going to spend a minimum $30-40k on an axle swap have more then one vehicle, or at least the financial means to acquire something...
I contacted Hot Metal Fab and they quoted me $325.95 including shipping for just the outer bars for a set of sliders as pictured below in 92" length (didn't have a gladiator near by to measure the exact length necessary!).
If you can weld this is an option.
You give the manufacturers too much credit! This also ignores differences in overall vehicle setup and usage.
A perfect example of all of this is Clayton Offroad. Their 2.5" lift they recommend the Fox shocks designated for 2-3" , and for their 3.5" lift they recommend the fox shocks...
This is why I am buying a tubing bender and notcher! I can get all that for $1100
On basic sliders its about $100 savings factoring in materials and counting my time as free as I enjoy this. Plans are to build front bumper/sliders for the Gladiator, bumpers/sliders/cage/shock hoops for my...
Sure anything CAN happen or COULD eventually lead to issues, but that does not mean it is likely to happen. You are sacrificing ground clearance to protect the strongest part of the axle.
If you look at vehicles built specifically for ONLY rockcrawling you will never see a skid plate on the axle...
I've never understood adding a piece of 3/16-1/4" steel to protect nodular iron that is easily 3-4 times that thickness. The only housing failure I have seen were either caused by grossly overloading the axle, involved high speed, or combo of the two.
How much did you extend your bumpstops? Your bump stops are going to determine the longest shocks you can use at full compression before things start to break
You also need to look at the front driveshaft and all of your brake lines, these are going to limit the extended length of your shocks...
If you are worried aftermarket parts not bought through the dealer are going to create warranty issues I don't see your plan working out.
Either just run the mopar lift as is or forget about the Mopar kit and go get the parts you really want. Trying to combine the two is just adding extra cost...
Looked at these 3 kits and my opinions on each (feel free to disagree)
Teraflex-
Pro's = Upgraded bump stops and not just extensions
Geometry relocation brackets in front should maintain onroad handling
Non adjustable control arms = no need to get front end...
Which kits are you looking at specifically? teraflex and clayton have a lot of different options
How are you planning to use your jeep?
Are you planning on keeping your factory shocks?
With this being the case I would skip the adjustable control arms and get geometry correction brackets, and also maybe consider less lift.
With the front driveshaft concerns do a little research, I have seen a few people around here list the max extended shock length you can run before you get...
Too much droop will also damage shocks! I don't care so much on my Toyota as it just has Rancho RS5012's, if I was running a more expensive shock and knew I would at least occasionally max out suspension flex I would for sure have real limiting straps to save the shocks. On the gladiator putting...
The chart I found on this forum lists 4 different fox shocks for 2-3" lift:
Fox 2-3" lift rear shocks collapsed length = 18.5", 17.4", 17.35", and 17.93"
Factory rear shocks collapsed length = 17.5"
With that info you can figure out what you need to do, if your new shocks are longer then...
Two very important points that you are missing:
Long Version:
1. Sounds like he isn't having any tire clearance issues so isn't going to be extending his bumpstops. That being the case he doesn't need longer shocks or extended shock mounts. Adding either of those would do more harm then good...