Home Page
  Photo Album
  Product Reviews
  Tech Section
  Jeep Central
  Readers Rigs
  4x4 Club Links
  Links Directory
  4x4 Vendors
  Cool Products
  Shop for Stuff
  Centralia PA
  Computer Help
  Site Index
  Project CJ-7
Jeep Project CJ-7

An ongoing Budgeted Rebuild/Build up of a Rock Crawling Machine.

Jeep Central
From Jeep History to Tech Specs and Projects.  This section is all about Jeeps.
Jeep Technical Info
Engine Swaps


ATV World
ATV Clubs
ATV Tire Mounting
Cool ATV Products
LiteFoot Track Sys
ATV Lift Installs
Quad Tire Reviews
ATV Laws By State
ATV Repair
ATV Manuals

Offroaders Guide to Gearing up for Offroad
From Basic Equipment to Well Equipped.  An extensive list guide to help you prepare your vehicle for the offroad.

Trailering Safety and Trailer Hitch Information

Off-Road Truck Driving Techniques and Safety

25 Top To Do Tips Before Going Offroad

Installing 23,000 Volt Offroad Lights

What are HID Lights?

Onboard Air
Converting a York
AC Compressor
to Pump Air

Warn 9500i Winch Installation

HEI Ignition
Installation & Review



Got Pop-ups
Spyware & Viruses?
Offroaders.com feels your pain. Let our Geeks help you...

Jeep Dana 300 TeraLow - 4:1 Gearset for the Dana 300 Transfer Case

Teraflex Tera Low 20 for the Dana 20 Installation

Tera Low 20
for the Dana 20


Warn X8000i
Winch Installation


From the
Department of Cheap   Tricks and Useful Tips

Ultra-Cool Hand Throttle for Free!

Jeep V8 Swap Tips

The Exploding Clutch

Radiator Protection using 6 bucks worth of material

Cracked Under Pressure - Fixing a smashed fingernail

A Cheap, effective alternative to undercoating

Home-built Saginaw Gearbox Brace for the cost of lunch!

Ammo Box Storage - Mounting Them for Quick Disconnect

Home-built Serious Skid-Plate protection for the Oil Pan for under 20 bucks!





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 range).

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 NP231.

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 1972.

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 Grand Cherokees.

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)



Jeep Wrangler JK
Jeep Wrangler JK Specs
Offroad Tire Info
P-Metric Tire Sizes Conversion to Inches
Tire Terminology
Wheel Terminology
How to Pick the Right
Tires for your Truck
Truck Tire Info
Tires - What Hits What Fits
All Terrain  Mud Terrain
Tire Reviews & Info
Mud Terrain MT Tire Reviews
All Terrain AT Tire Reviews
Super Swamper Bogger
Super Swamper SSR
Super Swamper SX
Super Swamper Vortrac
Interco IROK TSL
Super Swamper LTB
Super Swamper TSL
Super Swamper TSL Radial
Super Swamper Narrow
Interco SS-M16 Swamper
Thornbird TSl Radial
Thornbird TSl Bias
Thornbird TSL
Parnelli Jone Dirt Grip
BFGoodrich Krawler
BFGoodrich MT T/A KM
BFGoodrich Mud King XT
BFGoodrich MT T/A KM2
Bridgestone Dueler MT
Cooper Discoverer ST
Cooper Discoverer STT
Cooper Discoverer ST/C
Federal Couragia MT
Firestone Destination AT
Firestone Destination MT
General Grabber MT
General Grabber AT2
Green Diamond Icelander
Ground Hawg Mud Tire
Hankook Dynapro MT
Hankook Dynamic MT RT01
Hercules Terra Trac MT
Hercules Trail Digger MT
Kelly-Springfield Safari DTR
Kelly-Springfield Safari MSR
Kumho Road Venture MT
Kumho Road Venture KL71
Kumho Road Venture AT
Dick Cepek Mud Country
Dick Cepek F-C II
Dick Cepek Fun Country II
Dick Cepek Fun Country Nylon
Dick Cepek Fun Country Kevlar
Mastercraft Courser MT
Mastercraft Courser HTR
Mastercraft Courser HTR Plus
Maxxis BigHorn Radial
Maxxis Creepy Crawler
Maxxis Trepador
Maxxis Buckshot Mudder
Maxxis MA-SW
Maxxis M-8080 Mudzilla
Maxxis MT-754 Buckshot
Maxxis MT-753 Bravo
Maxxis MA-751 Bravo
Maxxis MA-S2 Marauder II
Maxxis MA-S1 Marauder
Maxxis MT-762 BigHorn
Nitto Mud Grappler
Nitto Terra Grappler
Nitto Dura Grappler
Nitto Dune Grappler
Nokian Vatiiva MT
Pit Bull Rocker Extreme
Pit Bull Maddog
Pit Bull Growler
Goodyear Wrangler MT/R
Pro Comp Xterrain
Pro Comp All Terrain
Pro Comp Mud Terrain
Pro Comp Xtreme AT
Pro Comp Xtreme MT
Toyo Open Country AT
Toyo Open Country MT
TrXus Mud Terrain
TrXus STS All Terrain
Michelin LTX A/T?
Michelin LTX AT2 Press
Michelin LTX AT2
Mickey Thompson MTZ
Mickey Thompson MTX
Mickey Thompson Baja Claw Radial
Mickey Thompson Baja Claw Bias
Mickey Thompson Baja Crusher
Mickey Thompson Baja ATZ Radial SLT
Competition Claw
Dunlop Mud Rover
Federal Couragia M/T
Nitto Dura Grappler
Yokohama Geolandar
Dick Cepek's 2008 F-250 Super Duty Project Vehicle ? Project CRUSHER
Mud Tire Reviews


Mud Tire Reviews

Jeep Rubicon Articles and Reviews

Jeep Rubicon Unlimited Articles and Reviews

Offroad Reports

Rausch Creek
Off-Road Park

Wheeling in the Valley of the Ferns

1.jpg (70086 bytes)
Tellico North Carolina

Paragon Adventure Park
Rock Krawl

Thousands more
photos here..?


Jeep CJ Axle Swap using
Scout II Dana 44 Axles

Building a Garage?
Need a Garage Plan?