QU40657U Used 7/8" Wide Hub Gear with Step

QU40657U Used 7/8" Wide Stepped Gear was the most common type from the the late 1970's to the late 1980s. Outside spline that engages wheel hub is a little under 5/8" wide. These gears are stepped on the outboard side to aid in removal and to space the gear back from the hub cap. QU40657 gears were usually used with QU40050 Spring and QU40035 Spring Plate in the 1970s or QU40654 1-1/4" long Split Steel Steel Spacer in the 1980s and 1990s. Available while supplies last.

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Dan the Gear Man® Tech Notes:
Product Note
History
Spring and Plate
Matching Parts
Applications

Tech Note 1:Product Note
QU40657 7/8" Wide Single Stepped Gear was used with with three different configurations. Many later production axles with axle shafts having a back edge of a snap ring groove located about 5/8" from the end use QU40657 Gear paired with QU40654 1-1/4" long Split Steel Steel Spacer. When used with QU40050 Spring and QU40035 Spring Plate, the back face of the axle shaft snap ring was usually about 5/16" from the end, however some applications use an inset snap ring (back edge about 5/8" from the end) which spaces the gear farther back in the hub.

Tech Note 2:History
Up until the early 1970s, splined hub gears were the "stock" equipment on most lighter 4x4s. If you wanted lockouts, you paid extra. With the advent of full time transfer cases in 1973, splined hub gears were used instead of lockouts on trucks with internally spined wheel hubs. When the full time transfer case fad died out after 1979, splined hub gears were pretty much dropped as facto