Re: [AMC-List] 4.0L in Eagle

[farna@xxxxxxx]

The later model HO 4.0L (91-05) is basically the same as the early one. There is no knock sensor so you don't have to worry about that. You can modify the bell housing and CPS and use a 4.0L flywheel or flexplate. The AW4 flexplate would need to be drilled for a 998 torque converter, and check fitting to see that it doesn't push the converter in the trans to far. I think a Chrysler trans (32RE?) was used on Wranglers and/or Grand Cherokees with a 4.0L. That flexplate will work with a 998 (the trans is an electronic version of a 998). 

Possible problems: 
The late model intake may not clear the power brake booster -- it will be close! I've seen one Eagle with a late model intake. If the engine shakes due to a fouled plug the intake will tap the power booster. The booster must be the small diameter type used on the latest model Eagles. I don't know when the small one was first used, but early Eagles have a larger diameter booster.

Another problem might be the exhaust manifold. The late exhaust exits closer to the center of the engine, the 87-90 exits between cylinder 4 and 5.

The good news is that the earlier intake and exhaust will fit the late engine. You'll have to make an adapter for the late throttle body to early intake, but that just requires a 1/4" thick aluminum plate about 4" square and should be easy to make with a drill press and hack saw. 

--
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AIM.html
(free download available!)

 -------------- Original message ----------------------

From: "Keleigh Hardie"

I've been driving a 4.0 Eagle for a couple of years now. Overall, it's 
worked very well. Here's what I can tell you, at least as far as using a 
87-90 Renix equipped Cherokee 4.0. If you're using a HO or later, I don't 
know about that...
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