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New-to-me XJ, help identifying mods (photo heavy)

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New-to-me XJ, help identifying mods (photo heavy)

Old 07-09-2019, 06:11 PM
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Default New-to-me XJ, help identifying mods (photo heavy)

Hey y'all,

I had a 1999 TJ 4.0 for a while and have been getting the itch to get back into a Jeep. My wife and I picked up a 2000 XJ this past weekend and I am so stoked.

It's got a 3" rubicon express lift, some aftermarket bumpers and skid plates, but other than that is mostly stock.

Hoping to get some tips from the community on what is not stock and what, based on images alone, looks like it is in serious need of help.



This battery brace looks aftermarket.

Any ideas on what this dangling cord is?

Not a lot of markings on the diff, but it looks like a dana 30?

This is the drivers side front end ... aside from surface rust and a lot of bushings probably needing to be replaced, anything else?

I have two fans, and they are electric. Is that aftermarket? Also, is anything else on this motor not normal?

Is this a stock header?

Looks like a new driveshaft was installed?

passenger front

rear driveshaft

what the hell is going on with this swaybar end link setup?

how's the t-case look?

something tells me the u-joins in here are so old they probably need to be replaced?

something tells me the u-joins in here are so old they probably need to be replaced?

is this an evap can or the fuel filter? where is the fuel filter
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Old 07-09-2019, 07:00 PM
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What I think I see.
Battery bracket is stock.
Somebody replaced the positive terminal at some point.
If you had an overhead console it would have an ambient temp read out.
That is the plug for that.
Looks like a Dana 30 to me too.
From the factory the fan on the driver's side is electric.
The passenger side is mechanical.
You have an electric on the passenger side too?
Kind of looks like a factory shroud on that side.
Tough to know if the drive's side is factory without a better shot.
I can tell you have a Federal Emissions '00.
This is a good thing.
I can also tell that it is factory from that Y pipe to the muffler.
Cause it is all one piece.
If it had been replaced at some point there would be the Y pipe, an intermediate pipe, and a cat.
3 different pieces.
That Y pipe connects to a 2 piece exhaust manifold.
Can't comment on the muffler.
Not sure what the black box is technically called but is fuel related.
The fuel filter is in the tank with the pump.
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Old 07-09-2019, 07:06 PM
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Sway bar bushings are shot. Might aswell replace them all.

Looks like the rear driveshaft is not factory. Could be a front driveshaft flipped around with a SYE? looks like funky I'm sure someone else will be able to ID it.

How do the motor mounts look?
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Old 07-09-2019, 09:00 PM
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Thanks! You are correct re: fans .... pass side is mechanical, attached to engine, driver side is electric.

Federal Emissions '00. This is a good thing.
Can you elaborate? Super curious.
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Old 07-09-2019, 09:02 PM
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I am thinking about getting an antirock swaybar, which would let me solve the entire swaybar bushing issue in one single step. Thanks for pointing that out.

I will need to check on the motor mounts.

It has 253k on it btw, if that helps steer anyone towards what might be problem areas.
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Old 07-10-2019, 01:44 AM
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Originally Posted by whalesalad View Post
Thanks! You are correct re: fans .... pass side is mechanical, attached to engine, driver side is electric.



Can you elaborate? Super curious.
'00 was the last year that came in both Federal and CA Emissions.
All '01's are CA Emissions
Federal Emissions just have 2 O2 sensors and one cat before the muffler. Your set up.
CA Emissions have what is referred to has the dual mini cat, in place of the Y pipe, another cat in the same position as yours, and 4 O2 sensors.
People seem to attribute heat soak to the dual mini cat.
Heat soak presents itself like this. You are driving around for awhile. You stop somewhere. Jeep is shut down for 20 minutes or so. You come back
out and start the Jeep and it is running all rough for a couple seconds. What supposedly has happened is that the fuel in the lines as vaporized some.
From the heat in the engine compartment. People believe that this is cause the front dual mini cat is right under the intake manifold, fuel rail injectors, etc.
People try to solve this in various ways. Hood scoops, raise the back of the hood by the windshield with metal blocks, making it so there electric fan will
run for a bit after shutdown, heat wrap around the fuel rail, injectors, on top of the manifold, etc.
This also can possibly throw misfire codes when it does happen. Guys chase this problem for years and sometimes never really seem to solve it.
I own an '00 with CA Emissions. I don't have this problem. At least not that I have noticed in the last 6 or so years I have had my Jeep.
Also just from a maintenance cost point of view. 2 less O2 senors to replace if and when.
A Y pipe cost about $45 compared to that front cat which probably runs close to $200.
Here is a picture of the dual cat set up I mentioned.

Last edited by Ralph77; 07-10-2019 at 01:48 AM.
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Old 07-10-2019, 01:54 AM
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Oh and I am pretty sure that your build date is before 1/20/00.
Can confirm this from the white sticker on the drivers side front door.
Also check the firewall white sticker to confirm I am right about it being Federal Emissions.
Now if this does have a build date of before 1/20/00 this not a great thing.
Guys appear to have problems replacing certain exhaust parts on these.
I have yet to figure out what you would need.
After 1/20/00 they went to a flange set up.
So remember how I told you that if it were after market parts the Y pipe, intermediate pipe, and
cat would be 3 pieces?
Lets say part of the pipe between the Y pipe and the cat rust out. Or you just bust the hanger on it.
Not sure what you would buy to fix that.
Couple guys have posted asking about replacing exhaust parts and I have tried to help but it is confusing
See the flanges at the links below.
Aftermarket Y pipe.

https://www.napaonline.com/en/p/EXP5...ndex=Universal

Aftermarket intermediate pipe.

https://www.napaonline.com/en/p/EXP5...ndex=Universal

What I believe to be the cat for a Federal emissions Jeep.

https://www.napaonline.com/en/p/EXX1...ndex=Universal

So if your cat was fine and the Y pipe is fine this might be an instance where a "custom" job
might be best if you needed to replace part of the pipe between the cat and Y pipe.
I hope this is not as confusing to you as I think it is.
Also this is a "We will cross this bridge if and when" thing. LOL.

Last edited by Ralph77; 07-10-2019 at 02:17 AM.
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Old 07-13-2019, 04:39 PM
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I recognize the hack-n-tap sye. Better than a tcase drop.

Look into the 0331 head cracking issues and make sure you don't let it overheat. I have an 2000 and I put in a mishimoto radiator and even in the city (Reno NV) it stays just below 210 so far this summer (mishimoto is also local to me so for replacements I don't have to ship if I happen to bust it). I hear clearwater heads is the place to go for a new cylinder head if you want.

Also, I notice your track bar heim joint is dirty, and maybe PO let it sit for a while. Might as well just clean the heim joint off real well and use a spray lube on it since it probably hasn't been done in a while. Will make it last longer. As well as grease what has a zerk fitting.

Ralph77's post is good about the exhaust and cats. I went baller and got Banks torquetube headers, magnaflow precats, a 2.5" high flow cat, and flowmaster40 muffler. The high flow cat was from performance curve and was the only weld in part, headers and precats are all bolt in. This setup reduced my heatsoak a lot, not sure if it was just replacing old stuff or what, but before on a trail I would sometimes stop just for 5 or 10 minutes and start it up again and have cylinder 3 misfire from heatsoak, hasn't happened once in 3 trail trips since installing new exhaust parts recently. I once even tried to get it to happen by running the AC for a while crawling down a trail and turned the engine off for just 3 minutes (I figure long enough to turn some etoh into vapor) and it idled decently smooth and no misfire codes.
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