4.2 to 4.0 engine swap question - JeepForum.com

 
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post #1 of 5 Old 12-05-2010, 12:57 PM Thread Starter
dmack3501
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1988 YJ Wrangler 
 
Join Date: Nov 2010
Location: Noblesville
Posts: 8
4.2 to 4.0 engine swap question

Need some advice!

I just swapped out my 4.2/TF-999/NP231 with a 4.0HO/AW4/NP231 on a 1988 YJ.

I seem to have too much angle on the rear drive shaft (it does connect & spin w/out binding) and the front drive shaft is a little too short as well.

Basically, it seems like the new setup is about 3" longer than the original.

Has anyone ever ran in to this before?

Am I just overlooking something simple?

Any input wuld be greatly appreciated!!!!

DMACK

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post #2 of 5 Old 09-05-2011, 11:31 AM
speedbump94
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1988 YJ Wrangler 
 
Join Date: Jul 2010
Location: plano, Tx
Posts: 48
i have an 88 yj also, what year was the 4.0 that you swapped in. i am trying to do the same thong.

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post #3 of 5 Old 09-05-2011, 11:36 AM
cevans87
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1992 XJ Cherokee 
 
Join Date: Nov 2008
Posts: 436
Do you have a lift kit?

You probably need a sye kit

Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
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post #4 of 5 Old 09-05-2011, 11:37 AM
cevans87
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1992 XJ Cherokee 
 
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Posts: 436
Both of you should look at my build thread about the 4.0 and aw4 swap

Built Not Bought #447, 1992 Jeep XJ Supercharged 4.7, 1988 Jeep YJ Auto 4.2L, 2008 Commander Limited HEMI, 1990 Jeep YJ 4.7L Fuel Injected AW4, 1981 Scrambler 304 Auto

I Am The Jeep Surgeon!!!
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post #5 of 5 Old 09-05-2011, 03:30 PM
bsakal
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1988 YJ Wrangler 
 
Join Date: Nov 2006
Location: King of Prussia, Pa
Posts: 118
I did a similar swap, although I installed an AX15 instead of an AW4. I bought new shafts, it was cheaper than having them made. The front shaft was too short. I installed a SYE in the T/C, and bought a Tom Woods rear shaft from Quadratec.

'88 YJ 4.0 AX15 NP231; '97 ZJ; '69 Charger SE 383; '66 Newport 383
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4.0 , 4.2 , driveshaft , swap , YJ

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