As promised, more about the WJ pump. 01-04 V8 WJs use a hydraulic cooling fan run off the p/s pump, and thus use a higher output pump. It's a direct bolt in upgrade if you reuse the stock XJ reservoir. Only modification is the high pressure output fitting would need to be swapped from the XJ pump to fit the smaller stock pressure line. I would have used the stock reservoir, but I broke the nipple off it trying to get the return line off. I do plan on swapping the XJ reservoir back on, because I can't quite get the plug for the second return line to stop leaking.
Here is what it took to fit the WJ pump with reservoir:
The WJ reservoir is a little bigger than the XJ, requiring a need to tweak the pressure line where it wraps around.
I installed the pump without the reservoir, plugged in the pressure line, and pushed it about 1/2" tword the engine. Be gentle with it, too much and you can kink the line.
There is also a second return line in the reservoir for the hydraulic fan than needs to be plugged.
It's going to kind of happen in three phases, initially it's just going to be Currie 4" coils, XJ/MJ bastard pack with MJ shackles, Bilstien 5100s, and Metalcloak trackbar with Poly Performance bracket and brace. Next up is long arms using the Poly long arm brackets, custom arms(maybe 3-linked) with Metalcloak Duroflex joints. Finally I'll get with Deaver probably and have them make me some longer leaf springs and go spring under. Fox, King, or Bilstein for shocks.
Well, I went into this knowing that there may be issues with using an A1 Cardone pump. I had a little bit of... supercharger-like whine, that came from the pump at higher(3k+) RPM from the time I installed the pump, so I knew it was a ticking time bomb. The plug I used for the second return line isn't sealing up and has been seeping, so I planed on replacing the reservoir with a stock 4.0 type from PSC, which just showed up in the mail today. I'm going to replace the pump one time under warranty, then if it fails I'm going to suck it up and buy a PSC pump.
Well the new pump is louder than the last, so a new PSC pump is on the way. If you can find a stock WJ pump out of the junk yard, I would recommend tring that.
However I did find out something that makes a HUGE difference when doing this swap. Remember the high pressure port that I swapped from the XJ pump to the WJ, so the XJ high pressure hose would bolt up?
I noticed that there is a big port difference between the two(XJ on bottom)
I realized that the smaller port was restricting flow, so I drilled it out. Oddly enough the XJ fitting fits perfectly into the WJ one, marketing the WJ fitting work almost perfectly as a guide for you when you drill it out.
It's not presicion by any means, but it works pretty well.
Ok PSC pump is in and works great, nice and quiet like it should be.
Ultimately I am very impressed with the potential of the WJ pump, if you can get a good one. I would attempt a junk yard one or two before getting a reman one, I'd even attempt rebuilding one. I would be really interested to see how one would do on something like a 37" tire, especially in conjunction with an under drive pulley, and Durango box.
Now for a back to back comparison WJ vs. PSC....... There is a noticeable difference. I am going to say it, the WJ pump, after I bored out the XJ high pressure fitting to match the WJ, seems to be a lot more powerful. The PSC pump is comparable to the WJ pump before I bored out the XJ fitting. I will be revisiting the WJ pump mod again on my MJ.
So on this wj pump it would help with my sluggish steering when bound up?
I like the PSC pump a bit better, the WJ pump felt too light and a little twitchy with stock tires. I think the WJ pump is just too much for stock tires. I got a chance do do a little mild trail riding with the last version of the WJ pump, and steering it offroad was light and easy, it'd definitely be a great upgrade for larger tires.
The guy that figured out this mod, said that he could burry his Jeep to the frame on 33"s, and with the WJ pump and Durango box, and could turn the steering wheel with his pinky.