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The Jeep NP transfer case was introduced in the model year. Despite the different nomenclature, they are essentially the same transfer case, with the bulk of their parts interchanging. They increased in reliability and strength in the early to mid-eighties and essentially hit their stride in the late-eighties. The has continued in the trend of chain-driven cases and is one of the most successful and popular of them all. The has a driver's side front output and centerline rear output.

The NP features two ranges; a low range gear that is a respectable 2. It features three modes; two-wheel-drive, four-wheel-drive and neutral - for a factory combination of 2H, 4H, N, 4L. This tag indicates a J transfer case, with a part number of , a build date of and a gear ratio of 2. Early NP's on Jeeps with a vacuum front axle disconnect feature as is usually evident by the presence of a vacuum switch on the NP did not have a true neutral disconnect when shifted into neutral.

The front and rear yokes remained connected. With the advent of full-time front axles in the Cherokee and Wrangler Jeeps, the vacuum switch was removed and Neutral became fully neutral, separating the input shaft from the output shafts and the output shafts from themselves. Early s from through featured a conventional mechanical cable drive speedometer output.

The design of the is very good. They were engineered for durability and simplicity of build - both an advantage to the OEM assemblers as well as individuals servicing them. The NP transfer case has turned out to surprise us in its strength, gearing, upgradeability and servicability. Most of our customers choose to retain their Jeep with their conversions.

It is very common for them to offer good service behind some of the strongest engines and transmissions. The standard weighs about 70 lbs. HD 's can weigh up to 80 lbs. Fluid capacity of the is from 1. ATF is the factory recommended fluid, however many individuals have chosen to run a straight 30 weight oil or 5W30 in a mineral or synthetic.

Our experiences with these and those reported to us by our customers indicate positive results in noise reduction and wear resistance. This transfer case is identified by its red and silver tag on the rear of the case. They are also easily identified by appearance. They feature a six-bolt front face. The GM versions use a five-bolt front face that is incompatible with the Jeep and Dodge six-bolt styles. The Chevy versions also use longer factory adapters and require the extensive mixing, matching and purchasing of parts to make them compatible for Jeep conversions.

The standard duty OEM transfer cases are capable of transferring from to ft. This is a result of good engineering and refinement. Adaptation to better transmissions is often less costly than rebuilding the weaker Jeep gearboxes and provides serious performance and strength upgrades.

The adapts very well to several popular transmissions, including:. Improving the 's Shifting Mechanism. Essentially all of them are clunky and problematic "Z-gate" shifters.

This shifter assembly also simplifies the upgrade to the above transmissions. One easily conquered drawback of the is its length. This problem is worsened by suspension lifts and resulting u-joint angularity. It is recommended that a heavy-duty short tail shaft conversion be performed to reduce the length of this unit.

Another thing to be aware of is the tendency of the slip-type yoke to pull and separate from the transfer case during extra articulation of the rear axle. A master rebuild kit. The is possibly the simplest of all the Jeep transfer cases to rebuild. Their assembly is intuitive, and parts are easily available and affordable. There is a great amount of variation in these Model input gears, depending on the transmission and year of the Jeep. NP speedometer gears are interchangeable to correct for tire size and axle ratio changes.

The appears to have reached the end of its main production in Jeeps in However, expect it to be well supported by the aftermarket for decades to come.

The NP has turned out to be one of the great Jeep transfer cases. They are tough, well-supported in parts and information and can be built for great strength. They run efficiently and may go many miles between rebuilds. Jeep Dana Model T90 to the Emissions Fuel Economy Conversions, Rules vs. Welcome Guest: Login or Register. A TJ driveshaft. Later 4LE.

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