4.0 into 2.5 tj

Like Jody says, it's a two step process: sign the back of the title on the 4cyl, and write a check for a 6cyl.

You need a lot of parts that won't be included in the TJ donor.
 
If you decide to punish youself and attempt the swap and need computer help to get it legit, let me know. A co-worker of mine reprograms Chrysler computers for side work and can make them work in other vehicles, or with other transmissions etc. He got involved in this because he swapped an AW4 into his daughters 97 TJ to get OD. He took a Grand Cherokee computer and reprogrammed it to run my Dodge 2500. I was just a test mule for him. My computer was fine.
 
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