No.
No, the 3.0 is a Mitsubishi engine and the bolt pattern and bell-housing shape are different.
A Grand Caravan would have a six cylinder.
There are no ECM hoses. The ECM is the Electronic Control Module.
All engines in that caravan are interference except 3.0 liter
no,4 cylinder transmission will not work
More info is needed. Interchange with *what*? A good parts supplier can identify cross references if you provide the vehicles VIN no. Be careful....a 4 cylinder ECM will most likely NOT work with a V6 or V8 ECM. Most ECM's come "dumb". That is, they have no Eprom or Calpack installed. When replacing an ECM, you need to change the Eprom and/or Calpack from the original over to the replacement. Fairly easy to do, requires a chip puller (9.95 at Radio Shack, probably 850.00 at GM's tool dept. And of course, DISCONNECT THE BATTERY FIRST TO PREVENT TOASTING OF NEW ECM.
Yes gran caravan use 31th or 41te The bell housing on a 3.0L is unique and will not interchange.
4 cylinder, yes 6 cylinder, no.
2002 - 2004 Altima and Maxima automatic transmissions interchange, if they are model RE4FO4B. The pans and filters are different but also interchange.
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Need to know if it's a 4 cylinder or a 6 cylinder.
It has one per cylinder. 4 for a four cylinder. 6 for a six cylinder.