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Unread 01-20-2012, 11:49 AM   #1
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1991 YJ Wrangler 
Join Date: Nov 2011
Location: Hibbing, MN
Posts: 79
motor swap?

have 91 yj 4.0 that is on it's last leg. I want to swap in another motor but having tough time locally tracking one down. however I found a 98 4.0. will this work with my harness and computer? my 91 is injection

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Unread 01-20-2012, 12:27 PM   #2
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1988 YJ Wrangler 
Join Date: Oct 2005
Posts: 49
It will work, just have to swap the sensors and accessories from your block to the new one.
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Unread 01-20-2012, 02:13 PM   #3
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1995 YJ Wrangler 
Join Date: Feb 2009
Location: Los Angeles. California. United States.
Posts: 4,911
There are certain differences in the evolution of 4.0 block. Your best bet is to find one with the same casting number. A 1998 / 4.0 xj block should have identical bolt patterns.
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