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FMM is actually both front and rear codes. FM is the rear, which, in your case is an Eaton 15201 2 speed, with 5.86 and 8.15 gears. M is your front axle code which is a 7000lb axle with power steering.
Beyond that, I unfortunately don't have any of the heavy truck manuals.
03-22-2009, 11:25 PM
