Spicer IPL: Models ON or AFTER June 10, 2013 - Manual (Page 51)

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Service Carriers
S170R - Retarder Ready Carrier
17.7" Ring Gear Diameter
Side Gear # 300GD101
These new carrier units directly replace single axle models
S23-170R, S26-170R and S30-170R with no modifications.
Side Gear New
Ratio Spline Carrier Notes
5.25 46 Inv 683349
S170BC - GenTech™ Quiet Gearing
17.7" Ring Gear Diameter
Side Gear # 300GD101
These new carrier units directly replace single axle models
S21-170BC, S23-170BC, S25-170BC with no modifications.
Side Gear New
Ratio Spline Carrier Notes
4.30 46 Inv 683394
4.78 46 Inv 683500
S170DBC - Diff lock w/GenTech™ Quiet Gearing
17.7" Ring Gear Diameter
Side Gear # 300GD101
These new carrier units directly replace single axle models
S21-170DBC, S23-170DBC, S25-170DBC with no modifications.
Side Gear New
Ratio Spline Carrier Notes
4.30 46 Inv 683501
4.78 46 Inv 683502
S170DR - Diff Lock w/Retarder Ready Option
Carrier
17.7" Ring Gear Diameter
Side Gear # 300GD101
These new carrier units directly replace single axle models S23-
170DR, S26-170DR and S30-170DR with no modifications.
Side Gear New
Ratio Spline Carrier Notes
5.25 46 Inv 683350