Drive units, adjusting and marking

WARNING: This page is about a different car, the 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Gear Set Markings And Adjustment Dimensions

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Code "0937" stands for Oerlikon drive unit with transmission ratio 37 : 9.

2 - Pair number (312) of drive set

3 - Dimension "r" referenced to controller of testing machine used in production. Dimension "r" is always stated in 1/100 mm. Example: "25" stands for r = 0.25 mm

Ro - Length of testing machine controller used.

Ro - Ring gear diameter 170 mm = 54.95 mm

Fig 2: Identifying Gear Set Markings And Adjustment Dimensions

Courtesy of VOLKSWAGEN UNITED STATES, INC.

R - Actual dimension between ring gear axis and end face of pinion at the point of smoothest running for this one drive set

Vo - Hypoid offset