No, they will not interchange.
If same engine, yes.
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.
R&R transmission pan and replace filter in pan..?
The bell housing is between the engine and the transmission.
It uses ATF+4.
A seat from a 1999-2004 Grand Cherokee is what fits in a 1999-2004 Grand Cherokee.
NO! they have different bolt spacing