Whats needed for 31spline install?

[Fast02]

I keep hearing that the 28 stock spline is weak and will break....so how hard is it to install 31spline axles? I have a chance to buy some new steeda 31spline for $200...maybe $185. And what does/is welding axle tubes and torque boxes.

Thanks I dont know very much about the 8.8's.

 

[DropTopPony]

rear diff for 31 spline