Overdrive 6-Speed Gear Set / Black / '90-'06 Big Twin

Baker 6-speed overdrive gear set with black trap door that converts '90-'06 Big Twin 5-speed cases to smooth highway gearing.

Five speeds was enough in 1990. Today's highways say otherwise. Baker's overdrive gear set converts your existing 5-speed case to six gears with a 2.94 first and a .86 overdrive sixth, dropping rpm at cruising speed while the roller detent shift drum and lead in ramped dogteeth make every shift smoother than stock. The black trap door version covers a wide range of '90-'06 Big Twin applications; choose the correct variant for your model and years.

Features

• Includes trap door, all gears, mainshaft, countershaft, shifter drum, detent components, bearings, snap rings, gaskets, and hardware
• Significantly smoother shifting than stock thanks to a roller detent shift drum with reduced inertia and gear dogteeth with lead in ramping
• Fits into stock and most aftermarket 5-speed transmission cases
• Bearing door manufactured from 6061-T6 aluminum with wider bearings and bearing retainer plates in place of stock style snap rings
• Gearsets made from 8620 steel; gears are cut before heat treating, then precision ground with diamond coated tooling for quieter operation
• Lower rpm for smoother highway operation and increased fuel efficiency
• Redundant Neutral Smooth Shift System
• Made in the U.S.A.

Specifications

• 2.94:1 first gear, .86:1 sixth gear
• Black trap door

Frequently Asked Questions

Do I need a new transmission case?
No. The gear set installs into your stock case, and most aftermarket 5-speed cases as well.

What does the overdrive actually change?
The .86 sixth gear drops engine rpm at highway speed, which smooths out the ride and improves fuel efficiency on long hauls.

What comes in the box?
Everything the swap needs: trap door, all gears, mainshaft, countershaft, shifter drum, detent components, bearings, snap rings, gaskets, and hardware.