I had a 1984 Wagoneer with a viscous coupling t-case and it was the best on road snow/ice vehicle I have ever driven. It didnt drift or break tires loose even with a 360ci. The front axle was a Dana 44 with drive flanges rear was an offset AMC 20 with 1 piece shafts, trans was a 727 or 999. The t-case might be adaptable to a TH400.
Selec-Trac
Selec-Trac was first introduced in the full-size Jeeps (SJ) in 1983 using the New Process NP229 transfer case. This system has the same settings as Command-Trac but instead of locking the front and rear drive shafts together in the "4Hi" setting the drive shafts were coupled together using a viscous-type coupler that works the same way as a viscous limited-slip differential does; which allowed the vehicle to be driven in "4Hi" on dry pavement. It was used from 1983 to 1991 in some applications.
The NP228 Selec-Trac transfer case is closely related to the NP229. The only difference is that the NP228 does not have a viscous-type limited-slip coupling. It was used briefly in 1986.
The NP242 Selec-Trac transfer case debuted with the compact Jeep Cherokee in 1984, borrowed from the AMC Eagle. It is a more common feature in the upscale version Jeep Wagoneer (XJ), and Dodge Durango models (1998–2003). It has a shift-on-the-fly transfer-case like Command-Trac but unlike it, Selec-Trac offers full-time all wheel drive in addition to the part-time 4WD of Command-Trac. Full-Time all wheel drive has the ability for the front and rear axles to rotate at different speeds, making driving on dry and wet surfaces possible year-round without shifting back to 2WD again. It still has the ability to lock the front and rear axles.
Other Jeep vehicles used Selec-Trac, for example, the Jeep Grand Cherokee, before being discontinued on that platform in favor of the electronically controlled Quadra-Drive II four-wheel drive system in 2005.
Selec-Trac uses the New Venture Gear NV242 transfer case[5] (formerly known as NP242).
Selec-Trac
Selec-Trac was first introduced in the full-size Jeeps (SJ) in 1983 using the New Process NP229 transfer case. This system has the same settings as Command-Trac but instead of locking the front and rear drive shafts together in the "4Hi" setting the drive shafts were coupled together using a viscous-type coupler that works the same way as a viscous limited-slip differential does; which allowed the vehicle to be driven in "4Hi" on dry pavement. It was used from 1983 to 1991 in some applications.
The NP228 Selec-Trac transfer case is closely related to the NP229. The only difference is that the NP228 does not have a viscous-type limited-slip coupling. It was used briefly in 1986.
The NP242 Selec-Trac transfer case debuted with the compact Jeep Cherokee in 1984, borrowed from the AMC Eagle. It is a more common feature in the upscale version Jeep Wagoneer (XJ), and Dodge Durango models (1998–2003). It has a shift-on-the-fly transfer-case like Command-Trac but unlike it, Selec-Trac offers full-time all wheel drive in addition to the part-time 4WD of Command-Trac. Full-Time all wheel drive has the ability for the front and rear axles to rotate at different speeds, making driving on dry and wet surfaces possible year-round without shifting back to 2WD again. It still has the ability to lock the front and rear axles.
Other Jeep vehicles used Selec-Trac, for example, the Jeep Grand Cherokee, before being discontinued on that platform in favor of the electronically controlled Quadra-Drive II four-wheel drive system in 2005.
Selec-Trac uses the New Venture Gear NV242 transfer case[5] (formerly known as NP242).
