It's a Mazda transmission, if that's what you are asking. Biggest known
problem is the leaking rubber plugs on the top of the tranny. They'll
eventually leak so much fluid, that you will damage the tranny. Trust me, I
know from experience.
My understanding is that the V-6's got a slightly beefier version of the
same transmission. So while they're basically the same, they're not exactly
the same. There was a good discussion of this recently at
www.ford-trucks.com According to that the I-4 has the "M5OD R1," which
translates to Mazda 5 speed, Overdrive, Revision 1. The V-6's get the "M5OD
R1HD," HD standing for Heavy Duty. The F-150's get the "M5OD R2," or
Revision 2. My understanding is that you can swap an HD in on a 4 cyl or
even a R2 onto a 4 cyl or V-6 Ranger, but you wouldn't want to take one of
the weaker ones and mate it to a stronger engine.
Hope that makes sense,
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