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Old 08-15-2011, 03:41 AM   #1
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motor swap 91 to 97

hello everyone. This is my first post and first jeep. Saturday I purchased a 1991 wrangler with a 2.5 and ax5. Going into the deal I knew the transmission needed work, but the motor seemed great (35 min test drive cold start etc.). 180 miles home and now i have a lot of smoke and quite a bit of blow by and the transmission is pretty much gone. Never the less my question is.

I found a 1997 2.5 with ax5 85,000 miles and pulled only because he wanted to swap to v8. It includes everything from throttle body to exhaust, accessories, ecm. wiring harness. is this a straight forward swap? or are there differences i haven't been able to find?

and if this is a straight forward swap should I stick with obdI or swap to obdII?

thanks so much in advance.

p.s. i have been reading you forum in preparation to purchase a jeep and have learned a lot so thanks for being here! and leaving a wealth of knowledge to be had. i've still got a lot to learn

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Old 08-15-2011, 03:48 AM   #2
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Old 08-15-2011, 03:54 AM   #3
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Thank you. good morning to you too
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Old 08-15-2011, 10:23 AM   #4
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biggest problem is its, odb2 so its nevr gonna run right, unless you take everything from that doner jeep including the cat and in-dash wiring. do you want to keep the 4 cyl for a reason or are you just looking for a cheap swap? you might want to look into getting a V8 or a 4.0 if you have to replace the motor and tranny anyway. if you decide to keep a 4cyl try and find a AX-15 tranny to use with it, they were used on 6cyl yj's from mid 88 to 95, it will never break.
and welcome to wrangler forum
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Old 08-15-2011, 11:24 AM   #5
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well for the time being i need a cheap swap and found what i think is a good deal on a motor and tranny $500 for both.

and i would like to just bolt it rather than cut ad pry and so forth.

are the motor and trans mounts the same?

How easy would it be to get that motor back to obd1 for close to plug and play as possible?
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Old 08-15-2011, 07:44 PM   #6
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i don't think it is possible to bring it to odb1, i'm not sure.

and i think you would have to cut moter mounts anyway since its from a tj.

what i would do is find a jeep grand wagoneer for like 500 bucks and take the 360 v8 and tranny out of that.
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Old 08-16-2011, 11:36 AM   #7
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bump
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Old 08-16-2011, 12:38 PM   #8
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Well I will say this much I have a 97 4.0 in my 93 and its obd1. Nothing about the engine is different, only difference might be the bellhousing bolt pattern. Odb2 is just a difference in how the ecu tracks emissions components and dtcs to comply with reducing emissions.

I say run with it, if nothing else just use the original intake and exhaust and sensors from your jeep.
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Old 08-16-2011, 01:14 PM   #9
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This swap will work it will be moderately easy. You will need to put your intake and exhaust on the 97 engine along with all of your sensors. It will bolt in. As far as transmissions they are different. The 97 has an external slave cylinder and your 91 has an internal slave cylinder. There are ways around this though. You can either put your bell housing and bearing retainer on the new transmission and use your internal slave cylinder. OR you can go to a local hose shop with pieces of your hoses and get connecters and use the external slave cylinder with the hoses spliced together. I did this when I swapped in a 4.0 in place of my 2.5 in my YJ.
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a bunch of other junk.http://www.wranglerforum.com/f14/94-...ed-136739.html
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Old 08-17-2011, 02:47 AM   #10
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fantastic! that's exactly the kind of information i'm looking for!
do you have link to or pictures of to the differences in the lines?
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Old 08-17-2011, 10:42 AM   #11
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Quote:
Originally Posted by PaulRevere1991 View Post
if you decide to keep a 4cyl try and find a AX-15 tranny to use with it, they were used on 6cyl yj's from mid 88 to 95, it will never break.
You cant swap the AX15 in place of an AX5, there is no adapter and the bellhousing is just different enough to prevent it from bolting up.

OP, I would look around for an upgrade to a 4.0 or GM swap personally.
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Old 08-18-2011, 11:48 PM   #12
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Originally Posted by disruptstudios View Post
fantastic! that's exactly the kind of information i'm looking for!
do you have link to or pictures of to the differences in the lines?
I don't have any pictures of it right now. I will be going out of town this weekend but if you are still interested I can post some on monday of the two hoses spliced on my jeep.
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a bunch of other junk.http://www.wranglerforum.com/f14/94-...ed-136739.html
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Old 08-20-2011, 04:20 AM   #13
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Well i purchased the motor and trans. got it home (8 hour drive in my 91 ranger with 274k that hasn't been off the farm in 2 years). I pulled my motor, trans, and transfer case today and everything looks good to go with the new motor im going to stay with obd1 because well its just easier. I will also have to change my intake manifold and throttle body. injectors and fuel rail. power steering and water pump back to the original stuff off the 1991 possibly the alternator as well.
ive taken tons of pictures and labeled everything im condering doing a write up on removeing motor trans and transfer case. and will also detail everything i have to make changes to ...

but i do have one glitch my trans. from the 91 looks like an ax5 but it has an external slave cylinder on the passenger side?? and obviously that makes it a different bell housing as well i will post some pictures .. i would like to know what this bell housing is off of? it bolts right up and everything looks normal but the bell housing has raised cooling fins or structural fins just like the trans?

i could be wrong. any ideas? will post pics tomorrow

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