CK5
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will using 1tons in a K5 cause more stress/ damage to the frame?

that's kind of a loaded question. Anything heavier (even unsprung weight) will have an affect on the frame, wether it is enough to damage it may be another story. Yes just driving down the highway there will be more reciprocating mass as you go over bumps in the road.

Now if you think that you need 1 tons, you probably have already put enough stress on the drivetrain to justify the additional strength of the axles, just remember that all you are doing is moving your weak link somewhere else. The 1 tons will take more tq before breaking, but that means that you had to apply more tq through the rest of the drivetrain to get it to the axles. If the tire still doesn't want to turn, the twisting force (tq) is still trying to rotate something even if it just breaks your motor mounts or pulls the tranny x-member out of the frame. You could always just use $h!tty u-joints and call them your "fusible link" to keep the added tq that the 1 tons will tolerate from breaking your frame.

Honestly, I wouldn't lose any sleep over it.
 
I think it's a downward spiral. Simply put, once you have bigger axles then you try bigger tires, bigger obstacles, harder lines, generally more aggressive wheeling. All this combined will eventually put way more stress on the frame and body then it was ever designed for. One of the biggest things you can do to combat the effects, put in a real good roll cage and tie it in to the frame at all points. I'm talking from the tailgate to the front frame horns like an 8 point or more cage. This will keep, or at least prevent, the frame from twisting.
 
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