Transfer Case Knowledge Gateway

The original. The Model 18 is a significant part of history, yet it is still a very relevant transfer case for a great many enthusiasts.

• 1941-1971 military & civilian Jeeps and IH vehicles
• Iron case, gear-driven, passenger-side offset drive for front and rear output shafts
• Tough as nails, compact and easy to service
• Adaptable to a broad variety of the great transmissions

The offspring of the Dana 18, the Dana 20 was the strong "silent-type" and it put a bit of refinement into 4wd.

• 1962-1979 Jeep CJ's, FSJ's , IH & Ford
• Iron case, gear-driven, passenger-side offset drive for the front axle and centered output for the rear axle
• Even stronger than its predecessor, yet still compact and easy to service
• Adaptable to a broad variety of the great transmissions

The culmination of Dana's transfer case engineering, the Model 300 was the final coup in gear drive.

• 1980-1986 Jeep CJ's, and the 1980 IH
• Iron case, gear-driven, pasenger-side offset drive for the front axle and centered output for the rear axle
• Slightly stronger than its predecessor with improved gearing and operation. Servicability and durability are premier
• Adaptable to more transmission options than any other

The surprisingly great Model 231 is ubiquitous, enjoying a long production run and a great success in chain-drive.

• 1987-2006 Jeep YJ, TJ, XJ, MJ, ZJ as well as GM and Dodge applications
• Aluminum alloy case, chain-driven, planetary-reduction, driver-side offset drive for the front axle and centered output for the rear axle
• Tough, with a great low-range and a myriad of aftermarket improvements
• Adaptable to the full array of excellent transmissions

Jeep clues into the deep gearing craze and releases the Model 241OR RockTrac.

• 2003-current Jeep TJ / LJ / JK Rubicons
• Aluminum-Magnesium alloy case, chain-driven, deep planetary-reduction, driver-side offset drive for the front axle and centered output for the rear axle
• Very tough, with a supreme 4:1 low-range
• Fully adaptable to a great variety of transmissions

The Model 242 is where things finally start to go well for a differential-ed transfer case

• 1987-2002 TJ, XJ, MJ, ZJ, KJ as well as GM and Dodge applications
• Aluminum alloy case, chain-driven, planetary-reduction, driver-side offset drive for the front axle and centered output for the rear axle, integrated differential
• Fairly strong
• Adaptable to a great variety of transmissions

The QuadraTrac was revolutionary gearbox, though it had a bit of a bumpy ride.

• 1973-1979 Jeep FSJ & CJ
• Aluminum alloy case, chain-driven, planetary-reduction, passenger-side offset drive for both front and rear axles
• Quite strong, yet a bit complicated and requiring attention to chain stretch
• Rarely retained in powertrain conversions

Chain drive hits the mainstream, if not yet its stride, in these early New Process transfer cases.

• 1980-1991 Jeep FSJ & early XJ
• Aluminum alloy case, chain-driven, planetary-reduction, driver-side front offset drive for the front axle and centered rear output
• Generally strong. Some models have viscous couplings, differentials and vacuum acutation, which take them out of the running for some serious Jeepers
• Sometimes retained in powertrain conversions and adaptable to many excellent gearboxes

The Model 207 was the springboard for the Model 231. It was generally successful.

• 1984-1987 Jeep XJ and 1987 YJ
• Aluminum alloy case, chain-driven, planetary-reduction, driver-side front offset drive for the front axle and centered rear output
• Tough enough for many situations
• Adaptable to a good selection of excellent transmissions

Military-grade strength is found in the Model 200, and the Model 200 is found only in the military M715 / M725 trucks.

• 1966-1971 Kaiser military trucks, and early Dodge militaries from 1947, onward
• Iron case, gear-driven, passenger-side front output and centered rear output. Divorced mount
• Outstanding strength
• Usually retained in conversions with its factory T98, or used with 2wd style transmissions