The forward axle drive units of these tandem axles have single-reduction, through drive carriers. The drive
gearing is made of a two helical gear train and a hypoid ring gear and pinion. Bevel gears are used in the main differential
and the interaxle differential.
The interaxle differential is located behind the upper helical gear on the input shaft. The forward side gear of the
interaxle differential is part of the upper helical gear hub and the through shaft is splined to the rear side gear of the
The M916A1, M916A2, and M917A1/M917A1 w/MCS axles are different from the M915A2 axle in the following
The axle has a wider helical driven gear.
There are two notches on the interaxle differential case of the axles. The notches permit the
differential case to clear the helical driven gear when the input shaft assembly is removed from the
Change 3 1-13