TNT Transfer Case

Jeep Vehicle Transfer Case Models

Re-manufactured Transfer Cases

TNT Transfer Case wanted to share some information  about the different Jeep Transfer Cases available.  Some of this information has been gathered from other Jeep enthusiasts and professional mechanics that desire to share their  cognition. Nosotros hope this information tin help you determine which transfer instance you need and whatsoever upgrades that might be available. Nosotros promise this might help in identifying the transfer case establish on your Jeep Vehicle.

Contact us today with any questions about your transfer example needs

Let'southward face it, sometimes SUV's, 4×iv'south and other Offroad vehicles, are a necessary function of life. Use your off road vehicle wisely.  Nosotros replace all bearings, seals, fork pads, sticky (when the unit has them) and chains (chains areMorse and only Morse chains). Each Transfer Case is unique and specific to the vehicle. Please locate the identification tag on your transfer case and write down the Model & Assembly Numbers. These numbers are disquisitional in determining the exact transfer case for your vehicle.

All of our rebuilt and new transfer cases come up with a 24 month / 70,000 mileage warranty

Jeep Transfer Case: NP208

The NP208 has an aluminum case and an appearance like to many other concatenation driven New Process transfer cases. It should take a tag on the back saying New Process Gear Model 208. It is a concatenation driven transfer case with a 23 spline input and standard circular bolt pattern. The output for the front end driveshaft is on the drivers side. Low range is around 2.62 and high is 1.00.
Identifying it:  Similar most New Process transfer cases, the NP208 has a circular tag affixed to the rear case one-half. If the tag is missing, you lot can hands tell it apart from other aluminum-bodied cases because the rear case half has a smooth exterior with few support ribs. It has a driver-side front end output and a larger-diameter tail housing compared with most other models.
Variations:  The architecture of the NP208 served as the foundation for numerous other transfer cases. There are many comparable cases out there that share the same visual cues, merely do not interchange with the Jeep-specific models. This can be a source of frustration. As well, GM had a version of the NP208 in K-series pickups, Blazers, and Suburbans from '81-'86. This model employed a similar-looking, still different circular mounting pattern than the Jeep NP208 and had a passenger-side front output. Ford versions have a driver-side drop. Other versions found in '80-'87 Dodge Ramchargers, one⁄2-, and 3⁄4-ton pickups used a passenger-side driblet like GM.
Usage: Total size Cherokees used the NP208 from 'fourscore-'83 and the J-trucks used it from 'lxxx-'86 or '87. The NP208 was the "Command-Trac" option for full size Jeeps during this time period.

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Jeep Transfer Instance NP228 and NP229

NP228 and NP229:  Found in 'lxxx-'84 full-size Cherokees and Wagoneers, the NP228 and NP229 were based on the NP208 and characteristic the aforementioned exterior shell and chain-driven 4WD system. The but difference between the two is found in 4-Hello. On the NP228 the center differential volition remain open in iv-Hello while the NP229 has a limited-skid differential to assist with high-range traction. Both units have differentials that will lock 100-percent when 4-Lo is selected and both feature a vacuum-operated middle differential.
Featuring chain-driven, planetary reduction in an aluminum instance, the NP228 and NP229 accept a 2.61-to-1 low range and direct in high. The NP228 had a straight-bulldoze 2wd mode. Using an internal, open differential for four-wheel-drive way and high range and featured a fully locked mode in four-cycle-drive, low range. It featured vacuum actuation for mode operation and a conventional shift linkage for range performance. This transfer instance was used in the XJ Cherokees as the optional in lieu of the NP207.
The NP229 was similar to the NP228, but information technology features an internal viscous coupling for full-time functioning. This transfer case was offered in the FSJ Grand Wagoneer.

Identification
The NP transfer cases are easily identified by the numbering in its red and silver tag on the back. The model number and gear ratio will be listed.

NP228 & NP229 Transfer Cases as establish in FSJ & XJ Jeeps, 1980-1991

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Jeep Transfer Instance: NP231 and NVG231

The NP231 has an aluminum case and information technology should have a tag on the back proverb New Process Gear, Model 231. New versions of the NP231 are referred to equally NVG231 or NV231 which stands for New Venture Gear. The tag on the back of the transfer case volition reverberate the proper name alter. Only the name is different. A NV231 HD model is used in some ZJs. Presumably this is a "heavy duty" version for Jeeps with the large V8s.
At that place are versions of this chain driven transfer example that accept 21 and 23 spline input shafts. The 23 spline version is used behind the AX-fifteen and the 21 spline is used behind the AX-5 and the BA ten/5. The output for the front driveshaft is on the drivers side. Depression range is two.72 and loftier is 1.00.

Identifying it:  Spotting the NP231 is easy thanks to the scarlet and silver tag on the rear half of the case. If the tag is missing, yous tin too identify them past appearance; they have a distinctive half dozen-commodities front mounting face.

Usage: 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 example in the Chiliad Cherokee (ZJ) since its introduction. The new Wrangler (TJ) continues to use the NP231, but the NP231 used in the TJ has a different tail housing that allows the removal of the drive shaft with out losing transfer case fluid. Both version of the NP231 used in the Wranglers have an over all length that is long for a short cycle base vehicle. This can cause driveline vibration and premature u-joint failure especially for a lifted vehicle

If y'all own a 21 spline NP231 and y'all want to bandy in a 23 spline transmission, ask us well-nigh upgrades.

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Jeep Transfer Case: NP242/NVG242

The NP242 has an aluminum case and it should have a tag on the back saying New Process Gear, Model 242. New versions of the NP242 are refered to every bit NVG242 or NV242 which stands for New Venture Gear. The tag on the back of the transfer case will reflect the proper name change. Simply the proper noun is unlike.
The chain driven NP242 is a full time transfer case with a 48/52 torque split up front and rear. It is possible to lock it into four depression then it behaves similar a role-time transfer example. When it is locked in, power volition exist divide regardless of traction. The output for the front axle is on the drivers side. Low range is ii.72 and high is 1.00.
Identifying it: The red and silverish tag on the rear one-half of the aluminum case brand it easy to spot. If the tag is missing you can likewise identify them quite simply past appearance. They have a unique-looking case casting with longitudinal ribs surrounding on the input side of the example. You tin also tell the NP242 apart from other cases by looking within the vehicle at the shift indicator. If the indicator has positions for "2WD, iv-office-time, 4-full-fourth dimension, Neutral, 4-Lo," it's a NP242. If the shift indicator makes no mention of both 4-part-time and iv-full-time, information technology'due south probably a unlike case.
Variations:  Aside from the Jeep variant, GM offered a version of the NP242 in the Hummer H1 and H2. The GM models characteristic a stronger output shaft and a wider concatenation. The important thing to await for on a NP242 is the spline count of the input gear. The NP242 comes in 21- and 23-spline versions with long and short input gears. A rare medium- length input gear is establish on '93-'95 ZJs with the 46RE or the '93 ZJ with the AW4 automatic backside the four.0L I-6.
Found in: '87-'01 XJ; '93-'98 ZJ; '99-'04 WJ; '02-'08 KJ.

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Jeep NP245 Transfer Case

Jeep Transfer Case NV247J/ NP249

Jeep NP249
This transfer example was manufactured by New Process. This model is a concatenation driven, The output is on the driver-side with center rear output. The NP249 was used in Jeeps. This unit has been utilized in Thousand Cherokee and M Wagoneer from 1993 to 1998. The NP249 was manufactured with manual shift, it is a total-time, 2.72:1 ratio, and has a magnesium instance has either 4WD full-time, neutral and low 4WD. These units have 23 spline inputs and 27 spline slip rear outputs. This unit has one specific consequence, it utilizes a viscid coupler clutch system that can neglect. Ane style to recognize this failure fashion is clicking sounds when turning on dry cobblestone or concrete surfaces. Viscid coupler failure is attributed to excessive heat build up.

The I.D. tag is located on rear of transfer case nearly where the driveshaft exits.

These cases came in '93-'98 ZJ (NV249 Quadra-Trac) and '99-'04 WJ (NV247J Quadra-Trac II). Each has a full-time 4WD system that automatically biased torque between front and rear axles. For the '99 WJ, the NP247 "Quadra-Drive Ii" was introduced. The organization used a gerotor pump to proportion torque through an internal clutch setup. When coupled with Jeep's Vari-Loc axles (WJ simply) the entire system was called Quadra-Bulldoze instead of Quadra-Trac II. Unfortunately, NV247s can exist problematic and expensive to repair and are non recommended as swap candidates.

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Jeep NVG 241OR RockTrac Transfer Case

The Jeep 241OR has a commuter'southward side front output and centerline rear output. The 241OR features ii ranges; a depression range gear that is an impressive four.0-to-one (the lowest of all the Jeep transfer cases) and a direct-drive in high range. It features three modes; two-bike-bulldoze, 4-wheel-drive and neutral – for a manufactory combination of 2H, 4H, N, 4L. Aftermarket modifications let for the addition of a 2 Depression position. 2003-2006 RockTracs feature a iii-wire, digital square wave Vehicle Speed Sensor (VSS) on the brusk tailhousing assembly, in the vein of mod automotive systems. 2007-electric current RockTracs do not feature a VSS, as speed sensing is relegated to the ABS reckoner, which in turn relays speed information to the ECM.
The 241OR is very skilful. They were engineered for immovability and simplicity of build – both an reward to the OEM assemblers as well every bit individuals servicing them. The NP241OR transfer case has turned out to be great in its forcefulness, gearing, upgradeability and servicability.

Identification
This transfer case is identified by its red and silver tag on the rear of the case. They are as well easily identified by appearance. They feature a six-bolt front end confront.
Though similar in nomenclature, size and configuration to the NP241 transfer cases, this unit of measurement has its own instance and many unique internal parts. Information technology has a fixed yoke output associates with an integral electronic speed sensor. The transfer example halves are unique in the overlap of the input assembly required by the larger planetary gears, and the rear half is engineered with generous ribs to handle the increased torque.

In 2003, and in response to the trends of off-roading, Jeep introduced the NP 241OR RockTrac transfer case in the upgraded Rubicon package in the TJ Wrangler Jeep. The 241OR, to date, is only found in Jeep vehicles.