From personal experience they are decent for the front but they will break I broke both fronts after a few months but in there defense I wasn't taking it easy for any of that time every time I went out I was trying to figure out what the weak link would be
Whats your rig specs? I had 16 spline Ouversons in the front of a heavy rockwell scrambler on 54s with a strong 383 and they lasted surprising well ......in the rear not so much lol...had to go 2" back there!
5400 they are good for the price if you are running stock shafts they will a big improvement but if you want to a shaft that you never need to worry about 2 inch is the only way