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Old 08-20-2012, 03:51 PM   #1
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Question 1988 YJ Motor Swap Help!!!!!!!!

Hey I have a 88 Yj I just picked up for a great deal. Only problem is the motor is blown, but I have a motor from a 94 Jeep Cherokee. The motor that is blown is a 4.2L carb and the spare I have is 4.0L FI. The motors look the same as far as I can see so my question is can I just stirp the spare block and put all the carb stuff on it and have it drop right in?

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Old 08-21-2012, 09:41 AM   #2
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no one knows?

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Old 08-21-2012, 01:08 PM   #3
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I have a similar problem.I have 1991 yj with a 2.5 blown engine. I have a Cherokee with an inline 6 that I was wondering if its possible to put in.yj is manual Cherokee is auto
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Old 08-21-2012, 01:28 PM   #4
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I would put a small block 350 in it! They make kits to do that and its pritty easy. I have no idea if you could put your other motor in that. Did u check motor mounts and see if they all line up?
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Old 08-21-2012, 01:36 PM   #5
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Quote:
Originally Posted by Stleger88
Hey I have a 88 Yj I just picked up for a great deal. Only problem is the motor is blown, but I have a motor from a 94 Jeep Cherokee. The motor that is blown is a 4.2L carb and the spare I have is 4.0L FI. The motors look the same as far as I can see so my question is can I just stirp the spare block and put all the carb stuff on it and have it drop right in?
To answer your guys question. Yes you can take the bare block 4.0 and put the head and carb on there. There's a few right ups on it if you google it.

Unfortunately there's tons of arguments on this issue. All the carb haters vs the injection guys.
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Old 08-27-2012, 07:42 PM   #6
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Thanks rebel good to know ill post some pics when i start
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Old 08-27-2012, 08:10 PM   #7
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mbrooks2 if you swap a four to a six you will need new motor mounts and then you have to consider does your tranny mount up or not. The I6 came with an AX-15 the I4 has and AX-5. Once your past that if you go with the AX-15 it may move your tranny mount back some on the T-Case skid plate. Then your driveshaft may or may not fit all things to consider. Search Google for the threads that cover the I4 to I6 swap and you wiill be in for some great reading
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Old 08-27-2012, 09:22 PM   #8
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Originally Posted by jokerchief462
mbrooks2 if you swap a four to a six you will need new motor mounts and then you have to consider does your tranny mount up or not. The I6 came with an AX-15 the I4 has and AX-5. Once your past that if you go with the AX-15 it may move your tranny mount back some on the T-Case skid plate. Then your driveshaft may or may not fit all things to consider. Search Google for the threads that cover the I4 to I6 swap and you wiill be in for some great reading
He's not doing a 2.5 to 4.0 swap.
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Old 08-27-2012, 09:23 PM   #9
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I retract that statement. I thought mtbrooks was the OP my bad for correcting you lol
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Old 08-29-2012, 11:42 AM   #10
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4.2 to 4.0 swap

I am currently doing a 318 swap into mine but researched all other possabillities first. depending on how "blown" the 4.2 is you have a few ways to go. either put the 4.0l in it as-is. Next option, assuming the 4.2 lower end is ok or worth saving, put the 4.0l head on the 4.2 block. this requires reusing 4L header and valvetrain. otherwise this is a normal swap for 4.2 guys who want either fuel injection on an originally carbed engine or want the claimed 40hp increase and better gas mileage. and the third way to go would be putting the 4.2 crank and rods in the 4.0 block and you get the 4.7L stroker engine. each way has thier ups and downs but in essence you can do any of these swaps with not alot of trouble and usually using oem parts. this is what i am trying to do with my 318 swap is use the least amount of aftermarket parts to do the actual swap and also keep from fabbing up too many things from scratch as well. this allows me to go to the local parts house and just buy what i need. just gotta keep a list of the vehicles the parts were for originally. If you have any questions bud we are all here for you.

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