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Location: Michigan, USA
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In 1987, Ford used 2 different suppliers for Ranger manuals: Mitsubishi 5-speed and Toyo Koygo (Mazda) 4- and 5-speeds. Also, it seems that both suppliers made 2WD and 4WD versions.
Some say that the pilot difference is split by engine:
87 Ranger 4-cylinder 2.0/2.3:
Pilot bearing (press into crank)
0.827" O.D.
0.586" I.D.
0.590 Length
Ford PN: D4ZZ-7600-A
Timken: FC65354
87 Ranger 6-cylinder 2.9:
Pilot bearing (press into flywheel)
0.827" O.D.
0.593" I.D.
0.590 Length
Ford PN: E3TZ-7600-C
Timken: F33126
Other sources say that the difference in pilot diameter depends on which manufacturer made the transmission, Mazda or Mitsubishi. Actually, this might be more plausible than the I4/V6 distinction. Hard to tell from all the dizzying array of information/misinformation on the internet. As usual.
So, no clear conclusion except to say that there is a larger ID needle bearing listed for the 1987 manual. Maybe that helps, maybe not.
Good luck!
____________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals, BW4406 manual T/C
Aussie Locker, Torsen L/S, 4.10's, Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, sway bar discos, Heated seats, Explorer EATC, Trip Computer and consoles
Other rides:
2016 C-MAX Energi (plug-in Hybrid)
2011 Taurus SEL (highway cruiser)
2003 Ranger 2.3L M5ODR1 Regular Cab (drudge)