I was at WalMart, and saw that Valvoline has a fully synthetic ATF+4 that is Chrysler approved. I was wondering if anyone tried it in the power steering yet, or do youthink it would be wise to go synthetic in the steering. As some of us on here, "myself included", has had off and on power steering issues, it seems that synthetic ATF+4 may help the rack and pump ? If one was going to switch, would draining the existing fluid and topping it off with synthetic suffice, or would it be better to only do it if changing the rack, etc. Otherwise, in just draining the old fluid. you would never get it all out, would the synthetic mix with the other ATF+4 ?

 

Really the only benefit would be less wear on the pump and less resistance, the same as using any synthetic fluid in your truck. You would get the full benefit out of the synthetic if you could remove all the conventional fluid, but it wouldn't cause any harm to the rest of your system.