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A-arms handle lots better when lots of travel is needed, the i-beams run into bad camber changes unless they are super wide and you have to change the beam to change the ride hight with correct camber. I would do A-arms if i was doin a full out TT
but for a prerunner and my race truck you cant beat the price, reliability, and functionality in a i-beam truck!
just remember when your 100 miles from anywhere and something breaks, whats easier to fix, if you look at the high dollar tt's there a-arm but they also have a machine shop on wheels chasing them incase something goes wrong. I dont have alot of experience with a-arms and not a whole lot more with I-beams, if set up right they both work well but my money is on I-beams litteraly