Are the automatic transmissions interchangeable from the 1983?

Question

and 1990 Ford Econoline vans with 351 CID engines? Thank you.

Answer 1

If both vans have C6 transmissions, then Yes. They are interchangeable between 1981 to 1991. Your 1981 should have a C6 if it came from the factory with a 351W engine. Should. 1990's could go either with a C6 (three speed) or an E40D (heavy duty automatic with overdrive).
If the later van is equipped with an E40D then the short answer is no. A quick look under both vans will tell you. The "pan" on each transmission will look identical if they are both C6's. An E40D has a pan that is a lot longer and a bulge hanging down in the middle of it. Very noticeably different.

Answer 2

No, the 83 probably has a AOD or C6 both use a vacuum signal and throttle kickdown, the later 90 model uses an AODE or a E40D both electronically controlled by the PCM or engine computer. You need to find out which transmission you have and go from there as to what your options are.

Answer 3

depends on the tranny some 90's had electronically controlled transmissions and 83 carbed versus 90 fuel injected so many different connections

Answer 4

find out which one you have first in it they may interchange,some of them will,first off you,ll need to know what you have in it,good luck on it,