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Old May 15th, 2020, 14:14
tballer4596's Avatar
tballer4596 tballer4596 is offline
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WJ Pump Woes- Still whining!

Alright everyone, I feel like I'm finally nearing the end of this seemingly never-ending WJ swap project. A brief synopsis:

Installed 4.7l WJ pump and Durango box.

Drilled XJ high pressure fitting to match WJ fitting (this may have been a mistake, but I don't think it was and I'll explain why)

Went insane trying to get all the air out of the system for days, weeks even, no matter what it whines like crazy. Blamed the pump, swapped in a new one, same issue.
Finally found a thread that mentioned that you have to use the larger 1/2" return barb on the reservoir or else the pump starved.*
Eureka! One custom barb to adapt the smaller xj return hose to the larger port and done. The problem was 90% solved. Whine was mostly gone and air stopped coming out like crazy.


It's still not perfect. My steering is good under power, the assist feels perfect. But as soon as I slow down and come to an idle it stiffens up way too much. It's very annoying. And there's still a whine.

​​​​​​​Some people say that you can't drill the fitting out all the way because there's too much assist and it causes the whine. Maybe. I'm willing to buy a new XJ fitting to try it out. But as it is, I don't have the feeling of "too much" or "twichy" steering assist at all. Under power it's perfect, exactly how I want it. I just want my steering to match that feeling at low speeds. And I'm not sure that restricting the fitting would solve that issue. So my question is, what on Earth do I have to do to get this working right. There must be someone out there who's done this mod and has found a successful combo! There's plenty of threads on this but none that mention poor assist at idle, it's mostly threads focused on the whining. Any help is appreciated.
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Old May 15th, 2020, 14:19
tballer4596's Avatar
tballer4596 tballer4596 is offline
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Re: WJ Pump Woes- Still whining!

I should also mention that the pump whines throughout the entirety of turning. If I turn the wheel, it starts whining immediately.
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Old May 15th, 2020, 15:31
smokeyyank's Avatar
smokeyyank smokeyyank is online now
Join Date: Jul 2014
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Re: WJ Pump Woes- Still whining!

I had this done on my XJ. Kept the stock XJ fitting no drilling or anything else, worked perfect.

How did you bleed the system?

Did you use all the XJ hoses? You don't need to swap them.
88 MJ truggy, 4.0HOybrid AX15, NP242 **Being built**
Mods: D44 w/ 4.30's, ARB front and Auburn rear, 33's
04 WJ, 4.7HO
Mods; 3" IRO lift, ADDCO rear sway bar, 4.7HO with bored fastman TB, AFE intake and Superchip tuner, 32s, lunchbox rear 242HD, 3" Kolak exhaust
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Old May 15th, 2020, 22:39
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ShoeterMcgav ShoeterMcgav is offline
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Re: WJ Pump Woes- Still whining!

Have you tried tightening the belt a little bit? Not sure if all the dimensions are identical on the dub j pump... Might just need a little more push at idle?

You mention "assist" a few times... As in power steering " assist" or "hydro assist"? Did you only swap the power steering pump and Durango gear box, or did you tap the box and add hydro assist as well? Might be a dumb question... But the wording has me second guessing what all was done
97 XJ lift lockers 35s mid arms 9"/hp30 trussed warn hubs wj brakes 1ton OTK 4.56s etc work in progress..
93zj BEAST 35s Claytons LAs 44/hp30 lockers bumpers headers etc $old

Last edited by ShoeterMcgav; May 15th, 2020 at 22:43.
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