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Old 06-15-2013, 10:11 PM   #1
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Physical Differences Between TJ Engine Compartments

If I wanted to drop a V8 (& auto tranny) into a 1997-1999 TJ, should there be a preference as to whether the TJ was originally a 2.5L or a 4.0L?

Is there a difference in the engine compartment, or with the firewall? Or are they pretty much identical, when it comes to the areas under the hood and body?

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Old 06-15-2013, 11:12 PM   #2
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The engine compartments are the same. Look at Novak.com for parts. Consider the Chevy 4.8.

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Old 06-16-2013, 12:21 AM   #3
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Quote:
Originally Posted by tbensor View Post
The engine compartments are the same. Look at Novak.com for parts. Consider the Chevy 4.8.
Novak.com brings up a family website.

http://www.novak.com/

I did find a few other NOVAK websites -

Www.novakautoparts.com
Www.novak-adapt.com

Were you referring to one of these?
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Old 06-16-2013, 12:34 AM   #4
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Old 06-16-2013, 07:51 AM   #5
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The Engine compartment in the 4.0L and the 2.5L are the same, but the location of the radiator, maybe set a little further back so as to accommodate the shorter engine block and allowing the fan to bring more air flow through it.
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Old 06-16-2013, 09:22 AM   #6
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The location of the radiator is the same between the 2.5 and 4.0. The real difference is the motor mounts which are about 5 1/2" farther forward on the 4.0. In the case of a V8 swap it doesn't matter since the mounts have to come out anyway
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Old 06-17-2013, 02:58 PM   #7
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Quote:
Originally Posted by vertical horizons View Post
Novak.com brings up a family website.

The Novak family site

I did find a few other NOVAK websites -

Www.novakautoparts.com
Www.novak-adapt.com

Were you referring to one of these?

Yea Novak Jeep Conversions - Home sorry about that
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Old 06-17-2013, 03:37 PM   #8
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4.0 can reuse mounts with bolt in mounts or weld in. 2.5 require weld in mounts. I did my swap into a 2.5 since the cost difference between the two couldn't make up the price point.

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