Replace 2.5 with a 4.0??? -
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Go Back > General Technical Discussions > Engines & Drivetrain > Replace 2.5 with a 4.0???

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Unread 09-04-2001, 06:15 PM   #1
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Join Date: Jul 2001
Location: Tri-Cities Washington
Posts: 35
Replace 2.5 with a 4.0???

I doubt my 2.5 will last much longer turning the 33's I have on my YJ. Besides, its too damn slow. (I bought it this way)
When the time comes to replace the engine, I dont want another 4 cylinder, now do I really want or need an 8 cylinder in there.
I would like to put in a rebuilt 6 cylinder.

Now my question, I have a 1990 YJ, what problems will arise dropping in a 6? Will alot have to be changed and modified? Are there any computer concerns I need to think about?
Im sure if I stick with a carburator that will make it somewhat easier. Right?
Also, is the 6 cylinder gonna make a big difference over the 4 cylinder that I have now? Like I said, I have 33's on it and would like to keep them.
Quadratec, from what I hear has really good rebuilt's, and the free shipping is surely a bonus. Do you all agree?

1990 YJ | 4 Banger | SOA | 33 x 12.5 | K & N Air Filter Restrictor Removed | [url=""]My 1990 YJ[/url]
Rage is offline   Reply With Quote Quick reply to this message
Unread 09-10-2001, 07:03 AM   #2
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2014 JK Wrangler 
Join Date: Sep 2001
Location: Santa Monica, CA
Posts: 1,254
Someone help this guy! I have the same problem!! Need help
Currently: '14 JKU

Past vehicles: '92 YJ, '97 TJ, '10 JK
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Unread 09-11-2001, 10:24 AM   #3
Smokin Dave
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Join Date: Sep 2001
Location: DFW, TX
Posts: 10
from what i have heard, if you are replacing the 4 banger, go with a v8, supposedly the tranny will bolt right up and all you will need are engine mounts
2000 TJ, 4" Procomp, 33x12.50 BFG A/T, etc etc
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Unread 09-14-2001, 03:19 PM   #4
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Location: midwest
Posts: 18
if you are going thru the trouble of swapping engines go for fuel far as a 6 or 8 well a 6 will satisfy you in terms of being better than a 4cyl but with an 8cyl you will have the added benefit of being able to rip apart your dana add in cost of a rear axle the ford 8.8 is an easy swap so even w/ the 6cyl it is a good idea to swap that rear axle anyway. what kind of tranny do you want auto, manual what type of gearing are you looking do you like to go muddin all of this will help narrow down the options but most important how much money are you willing to part with?
also smokin dave is wrong about the tranny bolting up to a v8 an AX-5 will not bolt up to any 8cyl and even if it did it would not last long.
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