I ran into this last summer. The hydro boost on my 01 cab n chassis is different than like 80 percent of the rest of them most cost around 250 reman at the parts house, mine is only available thru Dodge and it's 800$ .mine took to leaking bad . I saw a kit from pirate 4x4 that advertised universal hydroboost rebuild. I tried it and be dam if 50 dollar kit didn't fix me right up. No more leaks lol thought I'd mention this one