Transfer case part time kit for 80/100 series HF2a/av

Sumo Part-Time Transfer Case Conversion Kit – FJ80 Land Cruiser

Originally developed and manufactured in Japan by Sumo Gear, this proven conversion transforms your full-time 4WD 80 Series Land Cruiser into a traditional part-time 4WD system.

The Sumo spool replaces the factory center differential, eliminating the viscous coupling and providing a stronger, more direct transfer case configuration. When combined with manual locking hubs, the front drivetrain can be completely disengaged during normal driving, reducing wear on front axle components while improving steering feel and overall driving efficiency.

Benefits

• Converts full-time 4WD to part-time 4WD operation

• Eliminates the factory center differential and viscous coupler

• Reduces wear on Birfields, front axle shafts, differential, and front driveshaft

• Improves steering feel and drivability

• Potentially increases fuel economy

• Increases transfer case durability for off-road use

• Manufactured in Japan by the original designer, Sumo Gear

With the hubs unlocked, the vehicle operates in rear-wheel drive and the front drivetrain remains stationary. When additional traction is needed, simply lock the hubs and engage 4WD just as you would with a traditional part-time four-wheel-drive system.

This kit has been a favorite among 80 Series enthusiasts for years and remains one of the most effective upgrades for owners seeking improved efficiency, reduced drivetrain wear, and increased transfer case strength.