Overdrive 6-Speed Gear Set / Polished / '98-'06 Big Twin

Baker 6-speed overdrive gear set with polished trap door for '98-'06 Big Twin 5-speed transmission cases.

Highway miles pile up fast when the motor is spinning harder than it needs to. Baker's overdrive gear set gives '98-'06 Big Twins a 2.94 first gear and a .86 overdrive sixth inside the stock case, cutting rpm at speed while gears cut from 8620 steel and ground with diamond coated tooling keep the whole box quieter than factory. The polished trap door dresses up the right side while it works. 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
• Polished 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.