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Performance Upgrades - Maintenance - Modifications - Problem Solving. Covering the Explorer, ST, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar.
It will physically fit. Make sure if you have a 2WD truck, get a 2WD transmission, 4WD truck needs a 4WD transmission.
Are we talking about automatic or manual?
Later model A4LDs had changes to the valve body including going from one solenoid to two. If you are going from a single solenoid trans to a two solenoid trans, you may need to swap the valve bodies or figure something out on that. Not sure if 91 had a single solenoid or not, but there are differences in the valve bodies from year to year.
94 has two solenoids. 92 has two though they are a slightly different design. But should function the same. I put a 94 valve body with solenoids onto a 92 transmission and it worked great.
Year to year changes in the A4LD made it stronger and more reliable, with 94 being the best year in the Explorer. Many of the changes were in the valve body. I cannot speak for later year A4LDs like in Aerostars due to inexperience.
If you're going to the trouble of swapping your transmission, you might want to consider rebuilding the valve body at the same time. It is pretty easy with or even without the how-to guide on this forum. New solenoids, a TransGo or SK shift correction kit, and Sonnax upgrades of your choice will make your new transmission last longer and shift better.