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Old February 16th, 2006, 07:52 PM   #1
Icebreaker88
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XJ 4.0 Header ?

Is the exhaust manifold on a 4.0 tubular looking like a header or is it cast like most every other factory setup.
It looks like the XJ I just bought might have came with a header.
Thanks Mike
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Old February 16th, 2006, 08:03 PM   #2
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My 98 TJ came with a tubular factory manifold.

They crack.

Banks has made a fortune off it.
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Old February 18th, 2006, 11:34 PM   #3
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all 4.0L headers or Exhaust manifolds are tubular design and yeah they crack mostly around the collector.
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Old February 18th, 2006, 11:38 PM   #4
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DUDE! They're like, totally tubular.


If you need one, PM MonkeyEvil. He has one on the YJ he's parting out at JCR.
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Old February 18th, 2006, 11:44 PM   #5
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I just have to say it's odd, you posting in the jeep tech forum.:tonka:
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Old February 18th, 2006, 11:44 PM   #6
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Quote:
Originally Posted by h8pvmnt
I just have to say it's odd, you posting in the jeep tech forum.:tonka:

Newbie.

Last edited by PävementPounder; February 19th, 2006 at 11:05 AM.
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Old February 19th, 2006, 07:57 AM   #7
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Yeah its like starting over again. I know my Bronco & Ford stuff pretty well, With the Jeep its what trans do I have, what t-case do I have, What did this come with, and what did that come with
I have a few websites for Bronco related stuff .
What are a few good info sites for an XJ
I know of NAXJ or something like that
Its nice to know the specs the way they came stock,gears,axles,options, things like that.
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Old February 19th, 2006, 09:05 AM   #8
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In general, www.naxja.com has most answers. North American XJ Association..

4.0 HO motor
AW4 4 speed automatic, all electronic controls. (Aisin Warner, same trans in the Toyota trucks and 4 runners, and Mitsubishi Monteros).. gears are about 2.8:1 ist, and a 0.705:1 4th gear..

NP231 T-case

Dana 30 front, either a Dana 35 (7.5" ring gear, 1.1875" 27 spline shafts) or a Chrysler 8.25 (8.25" ring gear, 27 or 29 spline shafts.).. axles...

Probably 3.55 gears, thats what was factory.


With 32s, 4.10 gears would be no problem, with the nice overdrive. I want to switch mine to 4.10s with a rear limited slipwith my 31s(I'm also probably going to 32s when these wear out)...I'm thinking I'd find an explorer 8.8 with factory 4.10s/LS/discs and swap that..
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