4.0 swap - JeepForum.com

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post #1 of 66 Old 09-21-2013, 07:50 AM Thread Starter
bgi3
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4.0 swap

I'm thinking of doing a 4.0 swap from a 97 cherokee. I'm aware that I need a crank position sensor/damper kit. I'm gonna on a budget. What the cheapest why to do this.


24 hours in a day. 24 beers in a case ... coincidence?

When in doubt? GAS IT!!!!!

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post #2 of 66 Old 09-21-2013, 07:56 AM Thread Starter
bgi3
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Or would it be easier/cheaper to pull the fuel injection off and put it on my 4.2

24 hours in a day. 24 beers in a case ... coincidence?

When in doubt? GAS IT!!!!!

Parachute For Sale! Only used once. Never opened. Small stain.....

1984 CJ7, 4.0 FI, 31" BFG A/T,
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post #3 of 66 Old 09-22-2013, 02:35 PM
aggiejon
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My understanding is that the obdii 96+ are difficult to make the swap onto a 258. I had a 99 4.0 and wanted to use it. However the more I researched, my mind changed to stick with an obdi 92-95
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post #4 of 66 Old 09-22-2013, 04:42 PM
SLO_Ken
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I'm wrapping up the same swap. Here's a link to my thread...
http://www.jeepforum.com/forum/f8/ca...-swap-1530716/

I found that the physical differences between the 92-95 OBDI engines and the 96-99 OBDII engines are pretty much negligible. The only significant differences are that the computers are not interchangeable, and there is a second O2 sensor downstream of the catalytic converter. Also, the wiring is a bit different. If you want/need to run a check engine light, you need the gauge cluster from the 96-99, since there is not a CEL lead from the computer.

If you are on a budget, you can modify your current bellhousing and make a simple bracket for your CPS instead of using the Hesco ($$$) relocation kit.

The benefits of the 96-99 OBDII system (at least for me) are:
1) They seem to be much more available where I'm at.
2) The improved diagnostic trouble codes are way more helpful.

So far, I'm a little over a grand into my swap (not including costs I've recovered by selling old parts). All I have left to do is get an exhaust welded up, then take it to the smog referee to be inspected.

I hope this helps. Have fun!
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post #5 of 66 Old 09-22-2013, 10:45 PM Thread Starter
bgi3
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Quote:
Originally Posted by SLO_Ken View Post
I'm wrapping up the same swap. Here's a link to my thread...
http://www.jeepforum.com/forum/f8/ca...-swap-1530716/

I found that the physical differences between the 92-95 OBDI engines and the 96-99 OBDII engines are pretty much negligible. The only significant differences are that the computers are not interchangeable, and there is a second O2 sensor downstream of the catalytic converter. Also, the wiring is a bit different. If you want/need to run a check engine light, you need the gauge cluster from the 96-99, since there is not a CEL lead from the computer.

If you are on a budget, you can modify your current bellhousing and make a simple bracket for your CPS instead of using the Hesco ($$$) relocation kit.

The benefits of the 96-99 OBDII system (at least for me) are:
1) They seem to be much more available where I'm at.
2) The improved diagnostic trouble codes are way more helpful.

So far, I'm a little over a grand into my swap (not including costs I've recovered by selling old parts). All I have left to do is get an exhaust welded up, then take it to the smog referee to be inspected.

I hope this helps. Have fun!
Awesome..... thanks. I bought a 97 XY from a guy that was gonna scrape it cause the tranny went out for 425$. I think imma buy the hasco cps cause the XJ is a auto. And I would have to get a flywheel for a man. XJ. And they are rare around here

24 hours in a day. 24 beers in a case ... coincidence?

When in doubt? GAS IT!!!!!

Parachute For Sale! Only used once. Never opened. Small stain.....

1984 CJ7, 4.0 FI, 31" BFG A/T,
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post #6 of 66 Old 09-23-2013, 11:00 AM
SLO_Ken
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Quote:
Originally Posted by bgi3 View Post
Awesome..... thanks. I bought a 97 XY from a guy that was gonna scrape it cause the tranny went out for 425$. I think imma buy the hasco cps cause the XJ is a auto. And I would have to get a flywheel for a man. XJ. And they are rare around here
My engine was also from an automatic. I got a brand new flywheel off eBay for $63 shipped. Far less expensive than the Hesco CPS relocation kit.

EDIT: looks like they're up to $66. http://www.ebay.com/itm/LUK-LFW193-F...a99f28&vxp=mtr
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post #7 of 66 Old 09-23-2013, 01:43 PM Thread Starter
bgi3
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Quote:
Originally Posted by SLO_Ken View Post

My engine was also from an automatic. I got a brand new flywheel off eBay for $63 shipped. Far less expensive than the Hesco CPS relocation kit.

EDIT: looks like they're up to $66. http://www.ebay.com/itm/LUK-LFW193-F...a99f28&vxp=mtr
Great.... I can do that. How did you measure the bell housing for drilling.

24 hours in a day. 24 beers in a case ... coincidence?

When in doubt? GAS IT!!!!!

Parachute For Sale! Only used once. Never opened. Small stain.....

1984 CJ7, 4.0 FI, 31" BFG A/T,
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post #8 of 66 Old 09-23-2013, 02:32 PM
SLO_Ken
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Quote:
Originally Posted by bgi3 View Post
Great.... I can do that. How did you measure the bell housing for drilling.
I followed directions/dimensions given here...

http://www.jeepforum.com/forum/f8/of...ml#post8274428

and here...

http://s551.photobucket.com/user/Mar...?sort=2&page=1
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post #9 of 66 Old 09-23-2013, 07:11 PM Thread Starter
bgi3
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Quote:
Originally Posted by SLO_Ken View Post
Thanks.... you saved me a good bit of time and money.

24 hours in a day. 24 beers in a case ... coincidence?

When in doubt? GAS IT!!!!!

Parachute For Sale! Only used once. Never opened. Small stain.....

1984 CJ7, 4.0 FI, 31" BFG A/T,
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post #10 of 66 Old 09-28-2013, 02:55 AM Thread Starter
bgi3
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Quote:
Originally Posted by bgi3 View Post
I'm thinking of doing a 4.0 swap from a 97 cherokee. I'm aware that I need a crank position sensor/damper kit. I'm gonna on a budget. What the cheapest why to do this.
edit its a 96 cherokee..... and im using my factory T4 transmission....does this make a difference?
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post #11 of 66 Old 09-28-2013, 08:23 AM
ThisGuyUKnow
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if you are going through the trouble to put in a 4.0 why not use a nv3550 or ax15.

1985 CJ7 Laredo, 4.0, NV3550, D300, 3.31 AMC 20 w/trac loc
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post #12 of 66 Old 09-28-2013, 04:20 PM Thread Starter
bgi3
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Quote:
Originally Posted by ThisGuyUKnow View Post
if you are going through the trouble to put in a 4.0 why not use a nv3550 or ax15.
Cause I wasn't planning on doing the swap til this Cherokee fell in my lap and I just had the t4 rebuilt

24 hours in a day. 24 beers in a case ... coincidence?

When in doubt? GAS IT!!!!!

Parachute For Sale! Only used once. Never opened. Small stain.....

1984 CJ7, 4.0 FI, 31" BFG A/T,
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post #13 of 66 Old 09-29-2013, 06:21 PM
SLO_Ken
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Quote:
Originally Posted by bgi3

edit its a 96 cherokee..... and im using my factory T4 transmission....does this make a difference?
Shouldn't make a difference. I used a t5, which has the same case/pattern as your t4.

California 4.0 OBDII Engine Swap
http://www.jeepforum.com/forum/f8/california-4-0-obdii-swap-1530716/
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post #14 of 66 Old 09-29-2013, 06:23 PM
CSP
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There's nothing different about the '96 an 97 engines.
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post #15 of 66 Old 09-29-2013, 07:33 PM Thread Starter
bgi3
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Quote:
Originally Posted by SLO_Ken View Post
Shouldn't make a difference. I used a t5, which has the same case/pattern as your t4.
i didnt see this. thanks guys been alot of help. imma start jerking everything apart tomorrow and get ready for the swap. ill let yall know if i got anymore questions. thanks again.

24 hours in a day. 24 beers in a case ... coincidence?

When in doubt? GAS IT!!!!!

Parachute For Sale! Only used once. Never opened. Small stain.....

1984 CJ7, 4.0 FI, 31" BFG A/T,
bgi3 is offline  
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