Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum > 2.5 to 4.2? advice and opinions

Join Wrangler Forum Today


Thread: 2.5 to 4.2? advice and opinions Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
01-03-2013 09:35 AM
camarozz 4.2 is old school, not quite the horsepower of the 4.0. Probably the only real difference.

The AX5, well I wouldnt suggest running it, but like anything you can get away with a lot if you are really careful. But then, I thought that of the Peugeot in my jeep when I rebuilt the reverse set. Lasted a month.

Personally, I would either rebuild what you have and run it, or I would sell it and find an I6 and buy that, or shoot for the V6 and upgrade the drivetrain while I was at it.
01-03-2013 12:41 AM
dino_yj I have always heard that the trans wouldn't hold up but I didn't know, just wanting my jeep back. In reality I would like to swap in a 4.3 vortec.
01-02-2013 11:14 PM
WICruiser I do not know specifically about the 4.2 but everything I have read says that any other engine than the 2.5 would require a major change including engine mounts that are welded to the frame. The AX-5 transmission in 2.5 is not strong enough for anything with more power.
01-02-2013 09:19 PM
dino_yj
2.5 to 4.2? advice and opinions

Advice and opinions on this please:

I own a 93 yj 2.5 mpfi that needs top end rebuilt... I prefer swapping motors since the lil 2.5 is low on horses, and I think I could do this for cheaper than a rebuild.

I found a 4.2 out of a 90 wrangler.... But everyone seems to hate on these motors compared to a 4.0. Why? Has anyone had both? I've had neither. Do you think I would be happy with this swap? Has anyone done this? What are pros and cons of the 4.2?

Any information on the 4.2 , the swap into a 2.5 mpfi jeep, and opinions are welcome.

I have the ax-5 trans... Will it bolt up? Or hold up? This is mainly a street jeep with slight offroading.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -5. The time now is 12:31 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC