This is from my book.
High Performance Axle Package (A31)
3.91 axle gears w/ 8.75 HD Axle, Sure Grip, max cool radiator with seven blade fan and Hemi suspension (Rallye suspension). Available w/340 & 3838 1-4BBL Engines N/A with Air Conditioning
Super Performance Axle Package (A32)
4.10 axle ration w/9.75 Dana 60 Axle, Sure Grip, Front Disc Brakes, Power Brakes, Max cooling, 7 blade torque drive fan & Hemi Suspension. Available w/426 & 440 Engine with Automatic only. N/A with Air Conditioning.
Track Pack (A33)
3.54 axle ration w/9.75 Dana 60 Axle, sure grip, max cooling, 7 bladed torque drive fan & hemi suspension. Available w/426 & 440 engines with 4 speed transmission only. N/A with Air Conditioning.