The Audi 80-90 B3 (1986-1991) offers a comprehensive range of features for maintaining and repairing your vehicle's differential and final drive system. With detailed instructions and illustrations, this manual guides you through various procedures, including adjusting ring gear and pinion, replacing speedometer drive gear, and installing starter bushing. Whether you're a seasoned mechanic or a DIY enthusiast, this manual provides the necessary information to keep your Audi in top condition.