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12:07:56 - 10/31/2025
General Dakota Board
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mnkybrs
GenIII
 
3/14/2003
11:02:44
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 Subject: 3.9 and Jeep 4.0
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Message:
OK....silly question maybe.....
What is the difference between a Dodge 3.9 and a Jeep 4.0? I know they are both made by Dodge. Are there any parts off the Jeep 4.0 that can be used on the 3.9 for more performance or power? I am just curious and if anyone can help...let us know.
98 Dakota Sport C/C V6
Deep Amethist
Clear corners
Home Brew Intake Custom Made Grille
3923's DynoMax 17748
ASA TRS Wheels on 235/55R16 Kumho Tires
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CW
GenIII
3/14/2003
14:29:40
|  RE: 3.9 and Jeep 4.0
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Message:
First of all the 4.0 is a Jeep designed engine and a inline 6. That block originaly came out in the 60s.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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Fubar512
GenIII
3/17/2003
23:19:51
|  RE: 3.9 and Jeep 4.0
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Message:
The Jeep 4.0 is based on an AMC (Rambler) design, from the 1960's, as CW pointed out. It's a direct descendant of the 258 cid engine used in Jeep and AMC models into the 1980's. It's also an inline 6, as opposed to the 3.9, which is a V-6.
The 3.9 is basically a 5.2 (318), minus two of it's cylinders.
Confucious say: Any man can pee on wall. Be a true hero and crap on ceiling! I've tried being a hero once too often...
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