Harley Davidson Softail 6-Speed Transmission Gearbox Ultima LSD 201-59 Polished Finish 1991-1999. Ultima's® 6-SPEED Transmissions are the ultimate upgrade for bikes with 100+ horsepower engines. Designed to compliment our El Bruto® series engines, or any high horsepower unit you've created. They are packed with new features that meet or exceed standards expected of much higher priced transmissions and are delivered with a 12 month/12,000 mile limited warranty. Gears and shafts made from hardened 8620 steel. Pro-cut lead-in ramps for positive shifting. Steel shift forks for durability and longevity. Roller-detent gives you smooth, positive shifting action. Billet trap door. Reinforced transmission case machined from permanent mold A356-T6 aluminum. Close ratio 2.94 low gear set.