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Unread 01-14-2013, 12:22 AM   #1
Viper723
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A cheap college kids 4.0 swap... probably

I, like most of those with 4 cylinder YJ's, love my Jeep but feel like its a hazard just getting on the highway with 33's and lots of armor. I have been wanting a 4.0 but the price for the swap was just too much... I found an engine/trans combo I could not pass up however, so we begin. After 350 bucks I have a 93 MPI YJ 4.0 with a TF999 that is brand new attached. After realizing I could not get it out of the truck, I bought a 150 dollar engine hoist I will need anyways. So 500 bucks in and I need quite a bit still. I am doing this as cheap as possible, but I may make a mistake somewhere along the line. I hope you enjoy and learn from this swap. I will begin by collecting parts...

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Unread 01-14-2013, 09:19 PM   #2
boatsandhose
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Unread 01-14-2013, 09:25 PM   #3
jay-h
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you did get the computer and harness with it, I hope.
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Unread 01-15-2013, 04:32 PM   #4
Hghgrad
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Looks like a good start. Great price on the swap also. Did you get the driveshafts and stuff also?
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Unread 01-15-2013, 04:44 PM   #5
imstillatwork
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Since he already had a 95 MPFI 2.5 he doesn't really need the new harness, just needs to add 2 wires to the existing 4cyl harness for the 2 injectors. You can get the section needed from a junkyard with plugs for a few bucks. Everything else regarding wiring is the same minus the 2 injectors.

I'm not sure on driveshaft length with that trans?

Motor mounts will be the most labor.

Local exhaust shop can make exhaust line up and work for probably 20-30$

I'm jealous!
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Unread 01-15-2013, 06:43 PM   #6
Viper723
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Quote:
Originally Posted by imstillatwork View Post
Since he already had a 95 MPFI 2.5 he doesn't really need the new harness, just needs to add 2 wires to the existing 4cyl harness for the 2 injectors. You can get the section needed from a junkyard with plugs for a few bucks. Everything else regarding wiring is the same minus the 2 injectors.

I'm not sure on driveshaft length with that trans?

Motor mounts will be the most labor.

Local exhaust shop can make exhaust line up and work for probably 20-30$

I'm jealous!
What he said^^^ I do need the computer seeing as the guy threw it I need both driveshafts the 23 spline input shaft for my np231 and also a trans cooler I believe. I need a floor shifter for the auto and I want to do an electric fan... anything I am forgetting boys? I am grateful for having a 95 because it is much easier. I don't need a new harness, gas tank, or fuel pump either...
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Unread 01-18-2013, 10:56 PM   #7
Viper723
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Okay found out that it will be cheaper to get a new np231 with 23 spline input than to get the part... I found an XJ 4.0 1995 in the junkyard with a standard trans, so I think I am going to buy the AX-15 and the np231 for it then sell the auto... I just like standard better haha
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Unread 01-20-2013, 08:36 PM   #8
Viper723
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Pulled the trans and t-case, and I am taking all of the tools and parts to school with me so I plan on doing the swap this weekend... I should have my work cut out for me for sure... I need to clean the parts and paint some things during this week.

so far...
4.0 and auto 350.00
AX-15 and NP231 with clutch parts and flywheel 240.00
wiring harness and driveshafts 80.00

i am getting whats left tomorrow...
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Unread 01-21-2013, 02:14 PM   #9
imstillatwork
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Plan on setting aside another $200-300 for misc after you start running the motor. Used motors ALWAYS need something unexpected!
I won't run a used motor without a minimum of new spark plugs, wires, cap & rotor, coolant, oil, trans & xfre case oil, and go from there.

I'm still jealous.
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Unread 01-22-2013, 02:29 PM   #10
Viper723
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Took the head off just to be sure... and guess what! water... son of a *****
I honed that cylinder and It looks okay now, but that was not a welcome sight...
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Unread 01-24-2013, 11:56 AM   #11
Viper723
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I hope that one cylinder doesn't burn oil, but I am going to start doing the heavy teardown tonight... wish me luck. If I am going to get this done in a weekend I will need it.
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Unread 01-24-2013, 12:12 PM   #12
JeepinJeremy
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Quote:
Originally Posted by Viper723 View Post
Okay found out that it will be cheaper to get a new np231 with 23 spline input than to get the part... I found an XJ 4.0 1995 in the junkyard with a standard trans, so I think I am going to buy the AX-15 and the np231 for it then sell the auto... I just like standard better haha

I have a 23 spline input and planetary out of a 93 yj 231j. $60.00 shipped if you want. May be cheaper that a whole t-case.
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Unread 01-24-2013, 12:13 PM   #13
JeepinJeremy
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Your also going to need the frame horns out of a yj 6cyl frame unless you have a welder and plan to fab up your own.
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Unread 01-27-2013, 10:30 PM   #14
Viper723
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Well, long story short, I got all of the parts, put it all together over a long weekend, and got it running. This is where the fun stops... The engine has massive blow-by issues and pretty much needs rebuilding, so I am broke and without a car...
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Unread 01-31-2013, 02:12 PM   #15
Viper723
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I found another engine that I am going to pick up tomorrow, and then hopefully drop in this weekend. It is not going to be as cheap as it could have been now though... I just need my Jeep back ASAP
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