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Hello,
Does anyone know if a 1997 STS engine be replace with an engine out of a 2000 STS without any other modifications or would I run into a lot of problems?

Thank You
 

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94 ETC,97 STS
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It can be done but there were major changes to the sensors and timing wheel.
There is a thread from about a year ago where someone did this.
 

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2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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3,723 Posts
To get the computer systems of your '97 STS to work properly, you must use a 1995-1999 engine.
 
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