I don't know if this will help or not but maybe it will give you an idea of what the driveline will take. My brother-in-law was trying to pull a tree from his from yard. He dug a 360 degree trench round the trunk and cut every root. I hooked up my LC to the trunk with a tow strap and was on asphalt. My first attempt to pull the tree out of the hole failed, stopped me dead in my tracks. I decided to back up and hit it harder. My LC had built 350 backed by factory 3 spd trans and transfer case. The second time I floored it and when I hit the end of the strap it snapped me to a stop but chirped the tires and launched the LC into the air. The force caused my right foot to jam the throttle to the floor and when it came down the tires chirped again and threw the LC into the air again. Now this is with 33-12.5x15 tires. When it came down the second time I heard a loud pop or snap. I was able to push myself off the steering wheel and let off the throttle. I was able to put it in reverse and get free from the tow strap. I then pulled it into the driveway. While investigating what cause the noise I found the following; front passenger side axle had snapped and pushed the end out of my Warn hub. Inspection of the rear axle showed that the spider gears were gone but no axle damage. To get things repaired it took a new short front outside shaft, replacement Warn hub and new spiders in the rear axle. This was factory open axles.
Factory drive train will handle a whole lot of torture without failing. The tree wasn't free but it did reveal a tap root that went straight down and kept the tree from being pulled out. Axe through the root and it finally came out.
