Axle Ratio & Identification

Ring and pinion gear set with Klingelnberg tooth design, can be identified by the letter "K" stamped on the head of the pinion gear; Gleason teeth are noted by an "H or F" stamping. To determine axle ratio, divide number of ring gear teeth by number of pinion gear teeth. The number of teeth on ring and pinion, and the code for limited slip differential (S40), is stamped on right side of differential housing.

Fig 1: Exploded View of BMW Split Housing Differential

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Exploded View of Half Shaft Constant Velocity Joint

Courtesy of BMW OF NORTH AMERICA, INC.