OK, I just did a little reading about the WJ pump swap, and the reviews are very mixed. I've been having trouble with my stock PS system for a year, and I want to simplify things, not complicate them. What about a stock XJ 4.0 pump with the reservoir on the pump? I think the remote reservoir is what's giving me the trouble. Would a stock 4.0 pump with reservoir be a bolt on to my Renix 2.5?
PS - I have an extra serpentine PS pump pulley, if anyone needs it ;-)