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Is the '96 & up 4.0l the same as my '95?

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Old 03-15-2013, 06:41 PM
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Default Is the '96 & up 4.0l the same as my '95?

I am going to be swapping the motor from my '95 cherokee for a wrecking motor, and have found a pretty good deal on a '98 4.0l from a cherokee. Would this be a direct swap, or is this something that will take a lot of work, if its possible at all? I know that '95 and older is OBDI, and anything after is OBDII.

Thanks for any help.
Old 03-15-2013, 09:41 PM
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There are a few minor differences between a 95 4.0 and a 98 4.0. One thing is that there is not a water temp sending unit at the rear of the 98 4.0 cylinder head. The 98 has a stronger lower end because it had a main bearing girdle. The 98 will work for you, you just need to figure out what to do for the water temp sender.
Old 03-15-2013, 10:23 PM
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I believe '97 and up is when some minor changes (the temp sender for one) began.
Old 03-15-2013, 10:27 PM
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Originally Posted by Bustedback
There are a few minor differences between a 95 4.0 and a 98 4.0. One thing is that there is not a water temp sending unit at the rear of the 98 4.0 cylinder head. The 98 has a stronger lower end because it had a main bearing girdle. The 98 will work for you, you just need to figure out what to do for the water temp sender.
+1. If you keep your electronics you'll be fine. I believe most folks that perform such a swap drill and tap a new boss for the sending unit.

This is from an XJ or ZJ right? TJ blocks are slightly different
Old 03-15-2013, 11:33 PM
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I believe there are fuel rail differences too. Regulator is on the rail in 95, in the tank 96+
May have to retain that along with the electronics.
Old 03-15-2013, 11:48 PM
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Just use the 98 block and head with the 95 junk bolted to it.
Old 03-16-2013, 01:05 AM
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So if i'm understanding this correctly, basically all ill need to do is drill and tap the rear of the head on the '98 for the temp sending sensor, and swap all my '95 accessories on to the '98 long block?
Old 03-16-2013, 01:16 AM
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Yup. There are probably other places you can opt to put the sending unit if you extended the wiring.
Old 03-18-2013, 12:08 AM
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Any difference between the auto and manual?
I wouldn't think so, but a few wrecking yards have asked.
Old 03-18-2013, 12:22 AM
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Are you installing a manual? Yea, pilot bearing issues there. Pretty sure the engine will be ok if you keep the sensors that go with your current puter'. Like said the 98 FPR is not on the rail like yours is. I'm not at all sure how that works. I believe the pressure is the same, I can check.

And yea, you can relocate the temp sender to the t-stat housing, or drillnn' tap the head.
Old 03-18-2013, 06:46 AM
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Originally Posted by DFlintstone
Are you installing a manual? Yea, pilot bearing issues there. Pretty sure the engine will be ok if you keep the sensors that go with your current puter'. Like said the 98 FPR is not on the rail like yours is. I'm not at all sure how that works. I believe the pressure is the same, I can check.

And yea, you can relocate the temp sender to the t-stat housing, or drillnn' tap the head.
Sorry, should have stated. I have an auto,and some motors I have found are from a manual.
Old 03-19-2013, 04:24 PM
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So where is the water temperature sender located on the 98 engine as I'm doing the same swap only the other way round

Last edited by nipper; 03-19-2013 at 04:25 PM. Reason: crap spelling
Old 03-19-2013, 04:47 PM
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On 97+ the only sensor is in the thermostat housing, dash cluster gets a signal from the PCM
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