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Unread 08-25-2007, 10:21 AM   #1
rugbprop
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Join Date: Jul 2007
Location: California
Posts: 4
I'll try the YJ forum

I originally posted this thread in the TJ forum because I wanted to know about the TJ parts I was about to buy but I was not getting any love over there and a little abuse, so I moved this topic over here.
Here's the situation, I live in California and have to get a 1987 Wrangler smogged. The engine is pretty bad and the Jeep keeps eating clutches and starters. This Jeep had the Peugeot transmission and the whacked transfer case. So I decided to do a drivetrain swap. In California, in order to replace the engine you have to use an engine of the same year or newer (if your vehicle in newer than 1978 - I think) and have all the emmissions stuff.
So, I was originally going to swap a Ford (302) drivetrain, but a Jeep drivetrain became available. It is the chasis from a 1998 Wrangler, 4.0, AX15, don't know what transfer case, Dana 35c rear, but more importantly all of the electonics and emmissions stuff.
So me not being a Jeep guy I was asking the forum about opinions of doing that swap before I plunk down the money for the chasis. I wanted to know about parts problems or any anticipated problems of swapping that entire drivetrain.
Any help as soon as possible would be greatly appreciated.

Thanks!

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Unread 08-25-2007, 10:29 AM   #2
hip2Bsquare
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1994 YJ Wrangler 
 
Join Date: Jun 2007
Location: rapid city, sd
Posts: 47
leave california?

j/k there's a guy here that did the same thing to his yj, but it was to get a 4.0 instead of a 2.5, soit can be done, no idea how his emissions turned out though.
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1994 YJ, 4.0, Stock drivetrain, 4" skyjacker lift, 1" t-case drop
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Unread 08-25-2007, 10:36 AM   #3
intenseblu
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1987 YJ Wrangler 
 
Join Date: May 2007
Location: Northern NJ
Posts: 415
well your car will be ODB 2 then and emission controls should be superior to the old OBD 1 (air fuel ratio monitoring pre and after car to keep cat efficiency in check) ...

as for problems to keep an eye on ? get everything from the donor ... full engine harness, ECU, OBD2 plug from under dash with wiring... and get manuals from both years so you can crossrefrence vac diagrams for emissions and wiring...
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Unread 08-25-2007, 12:00 PM   #4
timatoe
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1990 YJ Wrangler 
 
Join Date: Aug 2006
Location: Grass Valley California
Posts: 13,815
As mentioned above make sure you get EVERYTHING from the donor. Once you've done the swap and everything's going, go down to a referee and get it smogged. I shouldn't be a problem.

As for hardware needed...... You may need motor mounts for the 4.0, (doesn't say in your profile) you should check with Brown Dog whose a vendor on here. http://www.jeepforum.com/forum/showthread.php?t=434224

You may also need a trans. skid from a YJ with the AX-15. I don't know for sure on either of those.

Good luck, I'm sure you'll do fine.

And as far as not getting any love from the TJ guys,,,,well, welcome to the Dark Side.
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Unread 08-25-2007, 05:09 PM   #5
rugbprop
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Posts: 4
Thanks

Thanks, I got the frame albeit twisted and I got the engine harnesses and the ecm and everything but the cab, so I have the skid plate for the AX15. Should I try to find a Dana 44, the 35c I've got came with 3.73 gears.

Thanks again!
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Unread 08-25-2007, 06:35 PM   #6
goatboy
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1989 YJ Wrangler 
 
Join Date: Feb 2007
Location: Fillmore, California
Posts: 2,449
Don't know how much help the referees will be until you come in with the swap completed, but were I you, I'd definitely lock down what the legalities are before doin' the swap... The referees will obviously become involved during the process. This forum is probably not the most accurate source for this information, but it may be useful if somebody points you in the right direction... However, that being said, if you can make an appointment with a referee station and ask them those questions, that might be the very best way to go!!!
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Unread 08-25-2007, 06:53 PM   #7
Hackle
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1989 YJ Wrangler 
 
Join Date: Aug 2003
Posts: 372
I did the same swap about 5 years ago on my 89 YJ. I swappped in a 98 4.0. I bought a wiring harness for it and it only came for a 95 OB1 motor. I changed all the sensors to that style as only the plug type that changed in the newer Jeeps. I installed the old style fuel rail with the preasure regulator in the rail.
It goes through emisions in AZ and I did not got to a referee. I don't think the guys at the test station even know it is a new motor. It looks like a stock wiring job. CA may be different. BTW I stayed with OB1 as the OB2 gets invovled with the comuter running all the gauges and that is a lot of work to change over. The Jeep runs great and is still the best mod I have done to date. HTH
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89 YJ Nearly Stock:)
3 link w/ coilovers front. 4 link coil over rear, 39.5" IROC's, Walker Evans Beadlocks, Rear 60 w/spool, Tera Low, Front 60 w/ OX Locker, Warn 9000, & a few others. New 4.0 HO
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Unread 08-25-2007, 07:05 PM   #8
Alfons
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1992 YJ Wrangler 
 
Join Date: Jul 2005
Location: Ontario, Canada
Posts: 2,218
Quote:
Originally Posted by Hackle
I did the same swap about 5 years ago on my 89 YJ. I swappped in a 98 4.0. I bought a wiring harness for it and it only came for a 95 OB1 motor. I changed all the sensors to that style as only the plug type that changed in the newer Jeeps. I installed the old style fuel rail with the preasure regulator in the rail.
It goes through emisions in AZ and I did not got to a referee. I don't think the guys at the test station even know it is a new motor. It looks like a stock wiring job. CA may be different. BTW I stayed with OB1 as the OB2 gets invovled with the comuter running all the gauges and that is a lot of work to change over. The Jeep runs great and is still the best mod I have done to date. HTH
I've just done the same in replacing my '92 I6 with an '05 I6 and converted it to OBD1 to avoid a total re-wiring. We have similar rules up here, but it's really the proof of what comes out of your exhaust that counts - I'd do the job without any official "referees" looking over my shoulder. If we change to a non-jeep motor, we need to reclassify our vehicle as a hot-rod which just means it doesn't have an approved OEM drive train.

The newer I6 with the redesigned intake manifold is noticably more powerful.
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