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Unread 01-09-2013, 08:46 PM   #1
Collin89Sahara
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Yj Engine Swap, Need some help guys!

Ok, after my Jeep sitting for months with a tired, broken engine. I have the resources to breathe new life into her!

If I can swing it, I would like to go with a budget AMC 242 stroker and an AX-15.

Can you guys help me come up with a list of things I need to make this swap possible?

Here is what I have so far:

1. Stroked 242
2. AX-15
3. Clutch Plate
4. Flywheel
5. 1991+ computer for my 1989.
6. Water pump
7. Thermostat
8. Radiator
10. Belts
11. Injectors


There are many other parts that I am sure I haven't thought of, can I please have some help on a list of all the "little" stuff I need to make this happen? For example, will I need to match the splines of the transmission to the transfer case. I know that the D35 won't be able to handle this load, I have a Chrke 8.25 and 29 spline/tracloc/3.55's in the garage as my rear end.

Thanks in Advanced,
Collin

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Unread 01-10-2013, 07:44 AM   #2
JeeperDon
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If the old drive train setup is stock and no mods added, I'd just pull the whole motor/trans/tcase, toss it, and swap in a newer version of everything.
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Unread 01-10-2013, 08:01 AM   #3
Collin89Sahara
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Quote:
Originally Posted by JeeperDon
If the old drive train setup is stock and no mods added, I'd just pull the whole motor/trans/tcase, toss it, and swap in a newer version of everything.
I am keeping the transfer case as it is fine.
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Unread 01-12-2013, 08:12 PM   #4
rjbruzan
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AX-15 will need a 23 spline T-Case as yours will be a 21 spline and AX-15 is 23 spline.
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Unread 01-14-2013, 03:49 PM   #5
JeeperDon
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Quote:
Originally Posted by Collin89Sahara View Post
I am keeping the transfer case as it is fine.
As was said just above, the t-case isn't fine. I can tell you that it's a PITA to swap the front input shaft in an NP231. You would be better off swapping that too. You asked for advice, thats what I advise.
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Unread 02-18-2013, 12:08 PM   #6
Collin89Sahara
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Thanks for all the input guys! Since money is tight and I am on a $2k budget, I won't be touching the trans or Tcase anymore. I do have a question though, would a 4.0l cam fit in a 4.2l?
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Unread 02-19-2013, 03:33 PM   #7
SgtJensen
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From what I've read, and what I plan on doing, it's better off the other way around - swapping the internals from the 4.2L (258) into the 4.0L (242) and stroking the 4.0L to a 4.6-4.7L.

Just a thought, and worth looking into.
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Unread 02-19-2013, 04:02 PM   #8
Collin89Sahara
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Quote:
Originally Posted by SgtJensen
From what I've read, and what I plan on doing, it's better off the other way around - swapping the internals from the 4.2L (258) into the 4.0L (242) and stroking the 4.0L to a 4.6-4.7L.

Just a thought, and worth looking into.
Looked into it. Going less on the engine and more on the trans might be better because the BA10 has 100k+ on it. Think it will hold up to 200-230hp?
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Unread 02-19-2013, 04:08 PM   #9
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I'd be surprised if the BA10 held up to a mouse fart to be honest. I'd look into swapping an AX15 in and mating it to the stroked 4.0L.
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Unread 02-19-2013, 04:28 PM   #10
Collin89Sahara
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Quote:
Originally Posted by SgtJensen
I'd be surprised if the BA10 held up to a mouse fart to be honest. I'd look into swapping an AX15 in and mating it to the stroked 4.0L.
If I can't find a 4.0 for dirt cheap, the 4.2 will get overbored .040, a 4.0 head, and a weber. Quick question, will a 4.0 cam fit in the 4.2?
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Unread 02-19-2013, 05:19 PM   #11
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Quote:
Originally Posted by Collin89Sahara

If I can't find a 4.0 for dirt cheap, the 4.2 will get overbored .040, a 4.0 head, and a weber. Quick question, will a 4.0 cam fit in the 4.2?
Not sure about the cam, but I'm pretty sure the cranks are swappable, IIRC.
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Unread 02-19-2013, 09:21 PM   #12
Collin89Sahara
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Quote:
Originally Posted by SgtJensen

Not sure about the cam, but I'm pretty sure the cranks are swappable, IIRC.
I know the cranks are, no questions. Just looking for the cam. I am 360+ miles away from home and I don't have my factory service manual to give me all the specs I need
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Unread 02-20-2013, 07:45 AM   #13
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On a 2k budget a better option would be a 5.2 or 5.9 dodge motor, new motor mounts, possibly center dump headers, a little wiring on your time, mated to an ax-15 with a dodge 3.9 bell housing. If you set the motor right, you can keep your driveshafts the same length. Also a new radiator. Thats about it for big items on this swap.

Thats if you don't want to stroke your motor. I had the parts to stroke a 4.0 to a 4.6 but ended up selling everything just because I wanted a V8 more.
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Unread 02-20-2013, 07:52 AM   #14
Collin89Sahara
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Quote:
Originally Posted by -jb-
On a 2k budget a better option would be a 5.2 or 5.9 dodge motor, new motor mounts, possibly center dump headers, a little wiring on your time, mated to an ax-15 with a dodge 3.9 bell housing. If you set the motor right, you can keep your driveshafts the same length. Also a new radiator. Thats about it for big items on this swap.

Thats if you don't want to stroke your motor. I had the parts to stroke a 4.0 to a 4.6 but ended up selling everything just because I wanted a V8 more.
Yeah, I'm not looking for a V8 swap bud.
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Unread 02-20-2013, 07:58 AM   #15
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Not a problem bud, was giving you another option for your price range.
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