I am about to order some shocks for my rear of my truck. I am looking into the fox shox but am confused of why they say the are for 2wd only... That shouldnt matter being a rear shock only right? Anyways, on to the next question, I was going to purchase either one of these just to go for it even though they say 2WD... What is the difference in price though? There the same 2-3" lift and everything but why is there such a price difference???