Kind of a dumb question...but regarding alternators for the disco: one for the 3.9 and one for the 4.0. Both pulleys have 7 groves I believe. I have a reman one for a 3.9 sitting around but have to replace one on my 4.0. Why would they not be interchangeable? Is there anything preventing me from using my reman 3.9 alternator on the 4.0 engine?


thanks for the help.