4.0 6 cyl heritage and history? - JeepForum.com
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post #1 of 5 Old 03-24-2007, 01:01 AM Thread Starter
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4.0 6 cyl heritage and history?

My father looked at my engine and said:

"That's an old rambler engine with fuel injection on it." .....and walked away.

later, I asked him about it, he said that its the same engine AMC/Jeep has been using for almost 50 years, and it started life in a rambler wagon.

How true is this? Whats the history on these motors?

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post #2 of 5 Old 03-24-2007, 01:12 AM
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yes, your father is correct. AMC/ Jeep was using that engine for many years. It was only slightly refined as it progressed in life. One of the best engines ever made in my opinion. Here is a little time line for you to look at. Go to year 1964 for a direct reference to the 4.0


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post #3 of 5 Old 03-24-2007, 01:13 AM
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well he's basically right its bigger obviously and it has a different head. but the bottom end is basically the same.

1998 sport 4.0 aw4/231 3.5in lift, moab wheels, 265/75/16 Kuhmo KL71
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post #4 of 5 Old 03-24-2007, 01:53 AM
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Someone told me the 4.0 was originally developed for Lincoln in the 60's, duno if there's any truth to that though.

99 XJ Sport, auto, np231s, sittin' stock K&N drop-in filter, ventshades.

And Yes I run pies in my XJ, and I don't know how the guy with the integra gets up those washed-out farm driveways.

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post #5 of 5 Old 03-24-2007, 11:47 AM
AZ Jeff
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Originally Posted by Pizza Man!
Someone told me the 4.0 was originally developed for Lincoln in the 60's, duno if there's any truth to that though.
Absolutely dead wrong. Lincoln (owned by Ford) NEVER used ANYTHING designed or built by American Motors (aka "Rambler").

Now AMC, on the other hand, used PLENTY of stuff made by Ford, when they were in business.

The 4.0 is from the same family of engines as the 258CID engine used in the AMC Pacer, Rebel, Ambassador, etc.

I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.
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