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I have a 1994 Grand Cherokee with a 1990 Cherokee 4.0 engine in it.. So i wuld have to say yes to your question.. ( i did not know it was from a 90 Cherokee until i had to buy some parts for oil change and none of the filters for a 94 would work.. :-)
No. They are not interchangeable.
1999-2004
No
No.
Most parts are the same through 1996 of course there are differences with 2/4 door and 4/6 cylinder.
The most compatible and completely interchangeable transmission that can be used with a 1999 Jeep Grand Cherokee Limited is the 45RFE transmission. This is from a 2000 Jeep Grand Cherokee. Only this model year is compatible with the 1999 model year as the vehicles shared 127 of the exact same parts.
look it up
2000 to 2006 wrangler 1999 to 2004 grand only cherokee
1994 1995 1997 1998 1999
gen1 and gen2 grand Cherokees 93-04. there are a few different engines
1999-2004 are the same body style. Most parts are interchangeable. The liftgate and window should be the same.