2005 F350 on 37's, I have gone threw 5 power steering pumps in the last year and a half. This pump just died today and it only lasted 5 months. All new suspension, ball joints, u joints, gear box, stabilizers and hydrobooster, I also flush the system every time i rifle in a new pump. I figure the big 37's kill the pump but i think they should last longer than a few months. Anybody else have any problems like this. I use to have problems where the steering would lock up but that went away after the last two pumps. I was thinking of replacing the power steering fluid cap, maybe its not letting the air pressure out like its suppose to. Anybody else that has any information would be appreciated.