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(1999 Lincoln Navigator)
in Detroit, MI on November 04, 2010
Will a 2001 Lincoln Navigator motor fit into a 1999 Lincoln Navigator model without changing anything? Both are DOHC 5.4L. I know it may have different specs, but i'm unsure.
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on November 04, 2010
1999 and 2001 are not explicitly interchangable according to the parts catalogs I have referenced. I cannot tell you exactly what is different, but they do differ.

I believe the cylinder heads are different for one thing. Base engine differences with electronics from a different year could cause some major issues - you may never be able to easily get the vehicle running right.

I have personally witnessed a 1999 frame with 2000 electronics and body that never passed testing.
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