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Unread 12-29-2003, 12:44 AM   #1
SC PuddleJumper
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Join Date: Sep 2003
Location: Moreno Valley, California
Posts: 18
4.0L or Chevy 350

hi all,

just wondering what you would do here.. I have a '93 Wrangler with the 2.5L, but the engine is wearing down and I have the opportunity to do an engine swap (remember I'm on a budget)..

I can get either of the engine for a good price, but the 4.0L does would include the whole "pig" (engine, tranny, rear axle, etc.), while the Chevy 350 would only be engine and tranny.. From all the posts and articles I've read, it's about the same amount of work, but the 4.0L gets better gas and I wouldn't have to buy any other part as my radiator is for the I6 engine..

My big concern for the 4.0L is the electrical and fuel injector.. I like carbs, but also would like to use my money on other modifications.. What would I have to do if I swap my 2.5L for the 4.0L.. Thanks for all the help in advance..


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Unread 12-29-2003, 01:14 AM   #2
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Join Date: Oct 2002
Location: South FLORIDA
Posts: 235
I'm no expert but from the research I've done for my own swap....

Going from 2.5 and upgrading, both might be similar work...the 350 might be way more powerful than your axles could handle...you just might be overall happy with the 4.0.

I went from I6 to a chevy 4.3 instead of a 350 specifically b/c i didnt want to swap to 8.8 rear as well as the fact that i didnt need THhhhaaaat much power. Going from my half dead 4.2 jeep engine to a chevy 4.3 carbed will be more than enuff power...
I went with 4.3 700r4/or 4L60 trans. and np231 with 2.5" rub. express suspension lift and posi-lock 4x4 manual locking- good luck, keep us posted
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Unread 12-29-2003, 01:47 PM   #3
Benjamin Dover
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Join Date: Oct 2003
Location: Southern Alberta
Posts: 39
If I remember correctly, California (as per you location listed) has laws governing the swaps of vehicle engines.

First, the engine swapping in must be of the same year or newer

Second, if vehicle came equipped with Fuel Injection, then the new engine must also have fuel injection.

Third, the emissions testing people will check that the swapped in engine produces less emissions than the original stock engine was designed to emit.

If you can pass all those tests with either engine, then

Now, as far as the work involved, its all the same amount of work. Its better to get the engine, transmission and transfer case all as one piece. The stock Jeep axles will be strong enough to handle either engine, and you will have the added bonus of the 4.10 gears! Fit either 33" or 35" tires to those axles and have fun.

If I remember the FAQ properly, the rear axle might have problems with 35" tires unless you do the Super35 kit, but till it breaks, I wouldn't worry too much about it.
Burn rubber, not your soul
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