Main >> Transfercase >> Factory
These articles detail the transfer cases that were offered from the
factory in various Jeep models. Transfer cases are arranged by the
most recently introduced first.
NOTE: Other auto manufacturers use New Venture (was New Process)
cases and they are generally designated with a letter to differentiate
them. IE: J for Jeep after the part number.
In order to narrow the scope of work to put these articles
together, they were originally written to cover only the transfer
cases found in CJs, YJs, and TJs. The scope is being expanded to cover
transfer cases used in all Jeep models.
NP-242: The NP242, (also known as the NV242 when it became 23
spline in '91), is a full-time transfer case used in Cherokees (XJ)
and Grand Cherokees (ZJ).
NP-231: Since 1988, the NP231 has been the "Command Trac" transfer
case used in Cherokees (XJ), Comanches (MJ), and Wranglers (YJ). It
has been the "Command Trac" transfer case in the Grand Cherokee (ZJ)
since its introduction in 1993. The new Wrangler (TJ) continues to use
the NP231 (except Rubicon which uses a NV241-OR Trac Loc with 4:1 low
NP-207: The NP207 was used in the first year of Wranglers in 1987.
It was used in Cherokees (XJ) until from '84-'87 and replaced with the
NP-208: The NP208J was an option used in 1980 to 1983 full size
Cherokees, Wagoneers, and some J-series pickups and a few '84 up Grand
Wagoneers till 1988.
Dana 300: The Dana 300 was used only in CJs from 1980 until 1986.
BW 13-39: The BW 13-39 "Quadra-Trac" was used in the CJ-7 from
1976 until 1979 and earlier in other models. It was introduced in 1973
in full size Jeep trucks (Wagoneers, Jtrucks and '74 to '79 Cherokee),
but it was not used after 1979 in any Jeep trucks and only used behind
the TH400 trans. The Quadratrac name was temporarily passed on to the
'80-'82 NP219. It's demise came about due to Jeep switching to Mopar
designed transmissions instead of the TH400 in an effort to gain fuel
economy. AMC was already using the transmissions in their cars since
Dana 20: The Dana 20 was used in CJs from 1972 until 1979. It was
introduced in larger Jeep trucks in the 60s, but it wasn't used in any
Jeep trucks after 1979. It was only used with standard transmissions
after '73. In 1980 it was replaced with the NP208J.
Dana 18: The Spicer/Dana 18 was used on the first CJs and their
military counter parts until 1971. It was also used on all other
trucks until around 1965.
NP-229 NP-228: The NP229 was used in '84-'87 except the end of '85
to mid '86 (replaced with the NP228 which was the same case, but no
viscous coupler) with the AMC 4 cyl and was designated as the "Selec-Trac"
transfer case in XJ Cherokees and XJ Wagoneers. It was also used mid
'82 to '91 in full size Jeeps as the "Selec-trac" option. It uses a
vacuum accuated 2wd/4wd flip switch on the center console (or dash)
routed directly to the transfer case, while the lever reads H-N-L.
Early models had a lockout to keep from shifting while moving because
the vacuum front axles had to be engaged or extreme viscous couple
damage would occur (in some cases within a minute!)
NP219: The NP219 (aka in FSJ circles as the "fake" Quadratrac
because it wasn't Borg Warner made) was used as an option '80 to early
'82 in Full Size Jeeps.
NV-249: The NV249 was used as a "Quadratrac" option in '93 up
NP-241OR: Used in Jeep Rubicon '03 to date, this Command-trac type
(officially known as Rock Trac) case features 4:1 low range and heavy
duty internals (the tcase was originally designed for Cummins diesel)