need assistance!!!

DP882dr · Feb 7, 2011

ok ive searcher a little on the forum and im still uncertaint about this.

ok i just got a 88 tbi2.5l xj to a ax15 with np231 but i have to pull my motor:gonnablow. should i rebuild my motor, rebuild with a bore over(how much), swap to a 4.0, or another swap. i may just buy another parts jeep since my jeep is no longer going to be a dd

whats going to be better for
1.my pocket
2.reliabilty
3. your personal oppinion

thanks for the help!

kastein · Feb 7, 2011

Wouldn't that have an AX5 not an AX15...? not sure.

I would stuff an AX15 and a 4.0 in it, but bear in mind you'll need to change some other stuff, wiring harness, ECU, etc.

What's wrong with your motor?

Talyn · Feb 7, 2011

Wasn't there some kind of fire wall changes from the older 2.5 to the 4.0l that would be required for the swap? I recall reading something like that.

kastein · Feb 7, 2011

Believe that was 84-86 ones only, the firewall is different and the radiator support is too. 87 and later the only difference is in the radiator support / inner fenders around it and all you have to do is unbolt some pieces.

Jeff in VA · Feb 7, 2011

87+ is redesigned to accept a 4.0 with no mods. You need a bunch of little doo-dads for the full conversion, but to get the motor to fire you only need the same-era underhood engine harness (and ECU) and swap the 2.5 fuel pump with a 4.0 one.

Jeff

DP882dr · Feb 7, 2011

my motor has a bad rod nock and yea it ussally would be a ax5 but i did a swap about a month ago

so is the 4.0 conversion worth the money instead of boring and rebuilding my 2.5 than putting in 18pound injectors and the 4.0throttle body?

Jeff in VA · Feb 7, 2011

for me it was, but I gathered parts as I came across them for awhile before I did the swap. It is 100% bolt-in, no fab work whatsoever involved, but you have to make sure you get all the right parts. I even had to pick up a couple of specific parts I never thought of (gas pedal, for instance) as I was doing the swap.

Your 88 is TBI, 4.0's are MPI......you can't swap throttle bodies and/or injectors.

Jeff

DP882dr · Feb 10, 2011

what about 350? is that just mounts and drive lines

old_man · Feb 10, 2011

Talyn said:
Wasn't there some kind of fire wall changes from the older 2.5 to the 4.0l that would be required for the swap? I recall reading something like that.

No firewall changes on the 88, that was on the earlier 85. I did a 2.5L to 4.0L swap about 8 years ago.

When I swapped over, I actually built a 4.7L stroker. Talk about a change.

need assistance!!!

DP882dr

NAXJA Forum User

kastein

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Talyn

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kastein

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Jeff in VA

<---respect

DP882dr

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Jeff in VA

<---respect

DP882dr

NAXJA Forum User

old_man

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