I'm going to swap a '96 longblock into a '91,.... - JeepForum.com
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Unread 03-27-2013, 02:24 PM   #1
BGDG280
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1991 XJ Cherokee 
 
Join Date: Mar 2010
Location: Thornville, Ohio, Ohio
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I'm going to swap a '96 longblock into a '91,....

Are there any pitfalls and or things I need to make sure to swap and or change?

The '91 motor runs great but it has a bad rear main seal leak and a small knock at start up and it smokes under stress. I figure its tired.

The '96 is dry and runs beautifully, plus it seems to have more power than My other XJs.

Any advice would be appreciated guys. :-)

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91 XJ, Yellow, Dirty ALOT, 34 x 10.50 x 15 Super Swampers. Looking for Trails and Off Road fun!
95 XJ 2 Door 5 spd, 2" lift, 31 x 11.50 x 15 Super Swampers....this thing is a bada** for being nearly stock!
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Unread 03-27-2013, 05:16 PM   #2
1CleanTJ
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1999 TJ Wrangler 
 
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blocks should be the same, just swap over accessories /motor mounts from one block to the other
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Unread 03-27-2013, 06:39 PM   #3
Charley3
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1999 XJ Cherokee 
 
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My 96 XJ seemed peppier than my 99. Both had about 35K miles when I got them.

Were the 96 4L engines more powerful than other years?
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Unread 03-27-2013, 06:42 PM   #4
BGDG280
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I'm concerned with sensors, injectors and such, I know they are a physical match, its the small things that getcha LOL.

I read somewhere that there was some revisions done in '96.
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91 XJ, Yellow, Dirty ALOT, 34 x 10.50 x 15 Super Swampers. Looking for Trails and Off Road fun!
95 XJ 2 Door 5 spd, 2" lift, 31 x 11.50 x 15 Super Swampers....this thing is a bada** for being nearly stock!
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Unread 03-27-2013, 09:43 PM   #5
cruiser54
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1990 MJ Comanche 
 
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Just swap it as a long block and you'll be fine.
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If you own a Renix Jeep, you'll want to check this out. >

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Unread 03-27-2013, 09:55 PM   #6
mschi772
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Quote:
Originally Posted by Charley3 View Post
Were the 96 4L engines more powerful than other years?
Nope. 91-01 are all high-output 4.0s. I there were changes that may have bumped hp and/or torque be a couple points one way or another, but nothing big enough that you'd really feel it. I don't think anything changed from 96 to 98. Lots of things could have made one feel peppier. Maybe one had more drag due to bad brakes or bearing or aerodynamics. Maybe one was heavier. Maybe one had more wear/failing parts that you weren't aware of. Maybe all of the above. Maybe it was just your imagination. Maybe it was your instincts telling you the truth--that 96 XJ are the bomb diggity
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Unread 03-31-2013, 10:56 AM   #7
BGDG280
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1991 XJ Cherokee 
 
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LOL, bomb diggity, too funny.

I heard they are kind of a mix between years. No?
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91 XJ, Yellow, Dirty ALOT, 34 x 10.50 x 15 Super Swampers. Looking for Trails and Off Road fun!
95 XJ 2 Door 5 spd, 2" lift, 31 x 11.50 x 15 Super Swampers....this thing is a bada** for being nearly stock!
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