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  #1  
Old July 24th, 2021, 18:59
SurplusFan98 SurplusFan98 is offline
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98 vs 99 XJ differences

Hi all,


I have a 98 parts jeep and I'm looking at potentially buying a 99 that needs some of those parts. Can anyone comment on or link me to the differences in those year models? The 99 I'm looking at is the pre-coil pack version of the 4.0, but I know it has the better intake. The differences I know of are:



Intake is different
roof racks are different, but I believe compatible
computer is different I think (but idk why)
interior may be slightly different


Other than that I'm not too sure. I'm not super concerned about the cosmetic differences, but I would prefer that the engines and electronics were compatible. If that's not so, I'd love to know before I spent the money.


Thanks!
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  #2  
Old July 25th, 2021, 07:38
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Tim_MN Tim_MN is offline
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Re: 98 vs 99 XJ differences

98 and 99 are for all practical purposes identical, and everything will interchange.
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  #3  
Old July 25th, 2021, 12:48
tech1001 tech1001 is offline
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Re: 98 vs 99 XJ differences

Most 98 xj have a casting # 0630 Cylinder Head and the 99 Has the casting # 0331 that are known to crack unless it has been changed .
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  #4  
Old July 25th, 2021, 13:17
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Re: 98 vs 99 XJ differences

Unless changed by a shop or previous owner, all 98 and 99 have the 0630 cylinder head.

The distributor-less coil on plug ignition that was introduced for the 2000 model year was paired with the 0331 cylinder head.
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Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.
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  #5  
Old July 25th, 2021, 13:49
tech1001 tech1001 is offline
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Re: 98 vs 99 XJ differences

Late 99 had the #0331 head .
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  #6  
Old July 25th, 2021, 17:08
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Tim_MN Tim_MN is offline
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Re: 98 vs 99 XJ differences

That has been alleged, but never proven. Vehicles are built months and months ahead of sale, so it is possible for a 2000 model year to have been built in 1999, but that doesn't make it a 99.

I have a genuine Jeep XJ Factory Parts List and genuine Jeep XJ Factory Service Manual for both 1999 and for 2000, and nothing in either of the 1999 manuals mentions the coil on plug distributor-less ignition or 0331 head.


My 2000 was built on August 17, 1999 and has the distributor-less ignition and an 0331 head. The VIN and the DMV registration designate it as a 2000.


Report for VIN: 1J4FF58S7YL112xxx


1: Built in United States by DaimlerChrysler Corp.
J: JEEP
4: MULTIPURPOSE PASSENGER VEHICLE
F: 4001 - 5000# (1815 - 2267 kg) GVWR & HYD BRAKES
F: CHEROKEE(4X4)(LEFT HAND DRIVE)
5: CHEROKEE CLASSIC
8: Sport Utility 4 dr.
S: 4.0L 6 CYL Gasoline (MPI) - Unleaded (ERH)
7: Check Digit
Y: 00
L: Toledo Assembly #1 (Toledo, OH)
Body Code: XJJP74
Engine: ERH 4.0L Power Tech I-6 Engine
Transmission: DGS 4-Speed Automatic AW4 Transmission
Build Date: August 17, 1999
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Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.

Last edited by Tim_MN; July 25th, 2021 at 17:16.
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  #7  
Old July 26th, 2021, 02:05
Ralph77 Ralph77 is offline
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Re: 98 vs 99 XJ differences

Quote:
Originally Posted by Tim_MN View Post
My 2000 was built on August 17, 1999 and has the distributor-less ignition and an 0331 head. The VIN and the DMV registration designate it as a 2000
Does your exhaust have flanges or is it slip on?
One thing that always confused me was '00's made before 1/20/00.
Been trying to get a handle on how the exhaust is set up on one of those for years.
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  #8  
Old July 26th, 2021, 15:56
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XJI6191 XJI6191 is offline
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Re: 98 vs 99 XJ differences

I have a '97 & a '99 (build dates, 'cos that's what counts here) and the only difference I've found is the brake rotors & hubs (or is it the axle shaft?)
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Old July 27th, 2021, 18:46
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Re: 98 vs 99 XJ differences

Biggest most sought after upgrade in the '99 vs '98 was a different intake manifold. More rounded for smoother flow for more power. That is what makes the '99 slightly most desirable between '97 - '01 models, before the '00 went to more 02 sensors.

There were a few minor electronic tweaks I believe in the overhead console.
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  #10  
Old July 27th, 2021, 21:14
Unclewolverine Unclewolverine is offline
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Re: 98 vs 99 XJ differences

Never again 00 or 01, learned my lesson the hard way. Actually im just not going post face lift again. 95-96 is the sweet spot as far as I'm concerned.
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  #11  
Old July 28th, 2021, 11:39
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XJI6191 XJI6191 is offline
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Re: 98 vs 99 XJ differences

I've had the heads off all mine & not noticed a difference in inlet manifolds - but then I wasn't looking.

As I only really look at the OHC to put my sunglasses away, "a few minor electronic tweaks" would've passed me by. I mean I do, occasionally, glance at the compass or outside temp just out of curiosity but they really are Christmas cracker style novelties I can live without.

Just revised my thinking on 01's as discovered the Mayor will allow me to keep one outside my London house (& even drive it) without incurring some unsustainable financial penalty after October. The alternative was a 4.7 W but, been there, done that, (probably) never again.
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  #12  
Old July 28th, 2021, 15:34
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Re: 98 vs 99 XJ differences

Quote:
Originally Posted by Ralph77 View Post
Does your exhaust have flanges or is it slip on?
No flanges, the entire exhaust is slip together and muffler clamps.
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Quote:
Originally Posted by bimmerjeeper


Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.
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  #13  
Old July 28th, 2021, 18:01
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Re: 98 vs 99 XJ differences

Comparison of 98 vs 99 intake manifold...

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  #14  
Old July 29th, 2021, 12:14
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XJI6191 XJI6191 is offline
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Re: 98 vs 99 XJ differences

Yup, they're different alright - but doesn't alter the fact that even when I discovered the '99 head was cracked & immediately set about liberating the one from my parts '96 it didn't register that the inlets were completely different. Of course by the time I came to do the HG on the '97 (a few years later) I'd completely forgotten what the '99 looked like.
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  #15  
Old July 30th, 2021, 07:37
denverd1 denverd1 is offline
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Re: 98 vs 99 XJ differences

99 intake is preferred, but not by much
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