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JEEP ENGINE REPLACEMENT

  • Tiny
  • ldrasmussen
  • 1998 Jeep Laredo
  • 6 CYL
  • 4WD
  • automatic
  • 165,000 miles

We have two Jeeps that we need to replace the 4.0 engines on. A 1996 2 wheel drive and a 1998 4 wheel drive. We have found a 1994 2 wheel drive engine that we are planning on putting into the 1996. We have also found a 4 wheel drive replacement engine for the 1998 but it is out of either a 1994 or a 1996 (I can't remember for sure). My question is this. Will these engines be compatible with our Jeeps? We have heard that an engine for the 2WD has to come from another 2WD and also the same with the 4WD but our concern is the age difference in the replacement engines. Miles on each used engine is very close to the miles currently on our Jeeps. Thanks you so much for your time in considering my question.

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Wednesday, November 17th, 2010 AT 1:58 PM

2 Replies

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,409 posts

We only recommend direct fit parts. When you change years, it can cause problems as far as sensors, mounts. The injectors may need changed.

As far as the 2wd and 4wd, they are the same engine.

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Wednesday, November 17th, 2010 AT 2:01 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,243 posts

Trying to put a 94 engine in either of these will be a major problem. 94 is an OBD1 system and the Jeeps are both OBD2 systems so the operating systems are totally different. It's would also be against Federal law to do that since the 94 would not meet the emissions requirements for the newer vehicles.

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Wednesday, November 17th, 2010 AT 2:11 PM

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