Idler Gear
The idler gear consists of a helical gear (3) and a hypoid gear (4), has a hollow center, and is driven by the helical gear on the input shaft.
The idler hypoid gear (4) mates to and drives the hypoid gear on the rear output shaft. The input shaft, idler gear, and rear output shaft gear sets are precision machined and are not serviceable.
The idler gear is mounted in two tapered roller bearings (2 and 5). The bearings are given the correct preload and gears proper clearance during assembly by means of shims being fitted behind the bearing races in the housing and cover. If the shims are removed for any reason, the shims need to be reinstalled to their original locations.
For some models, there is an additional idler gear shaft (6) located inside and running through the idler gear. The idler shaft is sealed at each end by O-ring seals (1 and 7) within the transfer case and rear extension housings.