if i put 31s on my truck should i have the drive shaft angle checked?

 

Not unless you lifted the suspension. (I think I just remembered telling someone that a body lift affects the angle (if so I have to rewrite that) but that doesn't either). The only time you need to check driveshaft angle and more important : length - is when you drop the axles down away from the frame with a suspension lift. If you just put wheels on that are bigger it won't matter unless they hit the fenders and you need to lift it. *UPDATE* - checked the deal in sentence two - I was correct (but worded it funny).

 

Actually, (now that I mention it), you might want to turn your steering all the way to one side and be sure your tires don't rub on your frame in the front end at the back and front of the front tires when it's turned the whole way.