Here is a easy prevention trick that could help you not brake down on the trail
take a file, (I like to use a triangle shaped file)
Lay down your axle shafts and file a line down the shaft. (Your filling down the machining marks so your not weakening the shaft)
If your shafts are starting to twist so will the line, and you can replace them before they brake, causing more damage.
And be sure to keep the ears on your shafts clean. Nicks and dings will ether distroy your caps or bind them up causing them them to fail.
DONT USE A DIE GRINDER!!! you want to clean up the serface not open it up, A file and sand paper will work grate and could save you money!
and for your spares (lile these)wrap up the splines with at least a foot of duck tape so it's thick and can take a hit when there bouncing around your junk box on the trail.
I was told to paint a line down the shafts and the paint will peal off where it twists..I didn't like that idea cus you can't tell how much it has twisted and could chip off when installing and you replaced it for nothing.
So I figured this way would be better