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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
I believe that tranny is on full-sized trucks. Ours is R1. That said there aren't options for bolt on replacement other than the R1HD from a 4.0L SOHC Ranger. IIRC, first gear is slightly shorter.
I think the M5R1s that are in Rangers with the 2.3 engine have a lower first, and maybe second, but I don't recall if the bell housing bolt pattern is the same or not.