Jeep Wrangler YJ 1987–1995: Performance Modifications By Don Alexander with Quinn Thomas Jeepers rejoice! Bring new life to your classic Jeep YJ with this comprehensive guide to off-road performance and modification. More than 685,000 YJs were built between 1986 and 1995, featuring heavier and wider leaf springs, track bars, and sway bars for improved handling. With a vast range of aftermarket parts available — from lift kits and 37-inch wheels to upgraded brakes, shocks, and Dana 60 axle conversions — this book is your roadmap to building the ultimate YJ. Veteran author Don Alexander covers every aspect of performance enhancement, including the 4.0-litre engine, transmissions (both automatic and manual), transfer cases, axles, differentials, and driveshafts. He also explores steering upgrades, brake improvements, suspension lifts, chassis strengthening, and interior modifications. Whether you’re planning simple upgrades like a lift and tire combination or undertaking a full rock-crawler-style transformation with engine swaps and heavy-duty suspension, this book provides expert step-by-step guidance for every level of project. About the Authors Quinn Thomas has been four-wheeling since age 17 and bought his first Jeep by 20. A dedicated rock crawler and off-road enthusiast, he and his wife, Heather, own All J, a Jeep off-road performance shop in Big Bear, California. Don Alexander’s passion for motorized adventure began in 1959. A lifelong Jeep aficionado and proprietor of the Jeep 4x4 School, he has trained thousands in off-road driving. His diverse motorsport experience includes oval track, drag, and road racing, as well as setting a diesel pickup land speed record of 222 mph. Author of 18 books and over 1,000 magazine articles, Alexander has also produced off-road training videos and hosted SoCal 4x4 Adventures and Extreme Jeepin’ TV shows.