When was the Jeep NP 231 transfer case introduced?

The Jeep NP 231 transfer case was introduced in the 1988 model year. Jeep’s YJ Wrangler and the XJ / MJ Cherokees with the Command Trac option were the first models to feature it.

Can a Jeep model 231 be rebuilt without lubricant?

Unless you own a TJ model 231, you will rapidly lose the ATF lubricant from the case if this occurs. The 231 is possibly the simplest of all the Jeep transfer cases to rebuild. Their assembly is intuitive, and parts are easily available and affordable.

Is the NP231 speedometer gears interchangeable in jeeps?

NP231 speedometer gears are interchangeable to correct for tire size and axle ratio changes. See this page to learn more about this. The 231 appears to have reached the end of its main production in Jeeps in 2006. However, expect it to be well supported by the aftermarket for decades to come.

When was the NP 207 used in Jeep Wrangler?

Thankfully the NP 207 was installed behind some of the weakest Jeep power trains every used. It featured a 2.60:1 low range and a straight through design high range, but featured a driver side front output. It was used in one year of the Jeep YJ Wrangler in 1987, and in the early XJ Cherokee ‘s from 1984-1987.”

The Jeep NP 231 transfer case was introduced in the 1988 model year. Jeep’s YJ Wrangler and the XJ / MJ Cherokees with the Command Trac option were the first models to feature it.

What kind of differential does a jeep NP228 use?

The NP228 uses an open differential for its front/rear power split in 4WD Fulltime High, the NP229 uses viscous coupling for its front/rear split in 4WD Fulltime High. Both lock the front/rear output shafts in 4 wheel drive in Low range.

What is the part number for a 231j transfer case?

This tag indicates a 231J transfer case, with a part number of 52099211, a build date of 6-21-99 and a gear ratio of 2.72:1. Early NP231’s on Jeeps with a vacuum front axle disconnect feature (as is usually evident by the presence of a vacuum switch on the NP231) did not have a true neutral disconnect when shifted into neutral.

Are there any problems with the Jeep transfer case?

Jeep Grand Cherokee owners have reported 164 problems related to transfer case (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Jeep Grand Cherokee based on all problems reported for the Grand Cherokee.

What is part number for New Venture Gear 231 transfer case?

Aftermarket modifications allow for the addition of a 2 Low position. This tag indicates a 231J transfer case, with a part number of 52099211, a build date of 6-21-99 and a gear ratio of 2.72:1.

Is the NP231 transfer case compatible with another jeep?

NP231 compatibility comes up from time to time and rarely can anyone say with confidence that an NP231 from one model and year will be a direct replacement for another model and year. The best bet is to stick with same model, year, and transmission unless you are prepared to swap the input shaft.

How many splines are in a Jeep transfer case?

After doing some research I found that a ’99 XJ cherokee with a 4.0L and a manual transmission should have a np231 transfer case should have 23 splines so i’m wondering if it would bolt in without modifications, or if the spindle length/input shaft/output shaft is different in some way.

Can a transfer case be used in a TJ?

OP wanted to know if the XJ transfer case he purchased could be used in his TJ without modification and it cannot. He’ll need to open the case and swap the input shaft in order for it to work with his TJ. Even if he had found a transfer case out of a 1999 TJ (same era), he would still be looking at an input shaft swap. Click to expand…

What kind of transmission does a 1999 Jeep transfer case use?

The best bet is to stick with same model, year, and transmission unless you are prepared to swap the input shaft. From what I can find, the 1999 XJ used an AX15 transmission and the transfer case had a 23 spline short input shaft.

What kind of transfer case does Jeep Wrangler have?

1987-1995 Jeep Wrangler (YJ) w/ NP231 Transfer Case. 1987-2001 Jeep Cherokee (XJ) w/ NP231 or NP242 Transfer Case. 1987-1992 Jeep Comanche (MJ) w/ NP231 Transfer Case.

Can a Jeep transfer case lose its lubricant?

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. Unless you own a TJ model 231, you will rapidly lose the ATF lubricant from the case if this occurs. The 231 is possibly the simplest of all the Jeep transfer cases to rebuild.

1987-1995 Jeep Wrangler (YJ) w/ NP231 Transfer Case. 1987-2001 Jeep Cherokee (XJ) w/ NP231 or NP242 Transfer Case. 1987-1992 Jeep Comanche (MJ) w/ NP231 Transfer Case.

What’s the stock rotation on a Jeep transfer case?

The New Process transfer cases used in late model Jeeps are always a left-hand drop configuration. The stock rotation on the New Process transfer case depends on the year of the vehicle and the stock transmission used. The rotations are approximately 13 or 23 degrees.

What kind of transmission bracket does a jeep 231 need?

As the transfer case bracket attaches to two of the mounting locations for the transfer case itself and is independent of the transmission, it will fit nearly all transmission applications. Fits all Jeep 6 bolt pattern NP/NVG (New Process/New Venture Gear) transfer case 231, 242 and similar (1988 up) EXCEPT for the 241OR which requires our SK3XR.

Where can I get a transfer case for a jeep?

Contact Us NP 231 Transfer Case Crown Automotive offers the largest line of Transfer Case replacement parts for Jeep®. Our applications include Transfer Case Kits, Gears, Bearings, Shafts, Gaskets, Seals and more for all Jeep® models. Home Parts For Jeeps

What kind of Yoke does the NP231 transfer case use?

This replacement slip yoke from Omix fits the NP231 transfer case foun… 43 tooth short shaft speedometer gear fits 93-01 Jeep Cherokee, 93-98

What kind of transfer case pads do jeeps use?

This set of NP231 transfer case shift fork pads from Omix fits 87-90 J… This outer input shaft bearing from Omix fits 88-96 Jeep models with a… This outer input gear bearing fits the NP231 and NP242 transfer case i…

What was the first transfer case for a jeep?

It was used in one year of the Jeep YJ Wrangler in 1987, and in the early XJ Cherokee ‘s from 1984-1987.” The NP228/229 transfer cases were Jeeps first transfer cases to receive the “Selec Trac” name, the later Selec Trac transfer case being the NP242.

Where can I get replacement NP231 transfer case parts?

We carry the largest selection of Jeep NP231 Transfer Case Parts around! If you are looking for OEM Jeep Replacement Transfer Case Parts or want to upgrade your NP231 transfer case parts we have everything that you will need!

What should I replace my NP231 transfer case with?

This replacement slip yoke from Omix fits the NP231 transfer case foun… 43 tooth short shaft speedometer gear fits 93-01 Jeep Cherokee, 93-98 42 tooth short shaft speedometer gear fits 93-01 Jeep Cherokee, 93-98 41 tooth short shaft speedometer gear fits 93-01 Jeep Cherokee, 93-98 …

Is the NP231 similar to the TJ speedometer drive?

The TJ introduced a similar vehicle speed sensor (VSS) however the speedometer drive used a new shorter gear assembly. The NP231 has long been the topic of many campfire debates as well as internet forum arguments. There has been much discussion as to the strength of this transfer case.

How much does a NP231 process 231 weigh?

The standard 231 weighs approximately 70 lbs. One of the easiest ways to identify the NP231 is the metal tag located on the back of the transfer case. This red and silver tag offers some valuable information concerning the transfer case.

What is the gear ratio of a NP231 transfer case?

This transfer case was manufactured by New Venture Gear. This model is chain driven. The NP231 is 4WD with manual shift. The NP231 was used in Chevrolet and GMC small pickups and Jeep. This unit was utilized beginning in 1992. The NP231 was manufactured with left side drop output and has a low gear ratio of 2.72 to 1.

Which is the best transfer case for Jeep?

NP 231 Transfer Case Crown Automotive offers the largest line of Transfer Case replacement parts for Jeep®. Our applications include Transfer Case Kits, Gears, Bearings, Shafts, Gaskets, Seals and more for all Jeep® models. Home Parts For Jeeps Transfer Case NP 231 Transfer Case Search Your Cart Cart | click to open/close Replacement Parts

Where can I find parts for my NP231 transfer case?

If you need more information or cannot find the parts you need give us a call 888-824-2012. Our Rebuilt NP231 Transfer Cases are tested before leaving the factory. This transfer case was manufactured by New Venture Gear. This model is chain driven. The NP231 is 4WD with manual shift. The NP231 was used in Chevrolet and GMC small pickups and Jeep.

What causes chain failure on NP231 transfer case?

This unit can have issues with premature chain failure, caused by running the NP231 transfer case on hard surfaces like concrete or asphalt, Run 4WD only on loose dirt, snow, mud, sand or grass as the different wheel speeds in turns can put excessive torque loads on chain and sprockets.

Is the NP231 transfer case good for Jeep 231?

They were engineered for durability and simplicity of build – both an advantage to the OEM assemblers as well as individuals servicing them. The NP231 transfer case has turned out to surprise us in its strength, gearing, upgradeability and servicability. Most of our customers choose to retain their Jeep 231 with their conversions.

What kind of fluid does a NP 231 transfer case use?

Recommended fluid for the NP 231 transfer case is automatic transmission fluid (ATF). We can provide a rebuilt NP231 transfer cases with a 12 month warranty we also offer all parts required to rebuild your unit, we have new parts we can also provide good used takeout parts to save you money!

When did the new venture 231 transfer case come out?

They increased in reliability and strength in the early to mid-eighties and essentially hit their stride in the late-eighties. The 231 has continued in the trend of chain-driven cases and is one of the most successful and popular of them all. The 231 has a driver’s side front output and centerline rear output.

How does the NP231 transfer case work on a jeep?

This is a result of good engineering and refinement. The early NP231 transfer case that was used in conjuction with vacuum controlled front axle hub disconnect on early XJ & YJ Jeeps did not have a true neutral disconnect between the front and rear axle when the 231 is shifted into neutral, as controlled by crown in the sector plate on the left.

Where to buy YJ Wrangler transfer case parts?

Whether you need to replace your entire 1995 Jeep Wrangler transfer case or simply find specific YJ Wrangler transfer case parts for sale, 4WD.com is the undisputed source for the best selection and value. Unlike other retailers, we’re jeepers, too, so we know what you need and why it’s important.

How to do Jeep transfer case shifting-shifting it smooth?

2) If the transfer case goes into Neutral with the engine running, and you can’t get it into the next mode without a grinding sound…just cut the ignition key, turn off the engine, shift into the mode you need, and then you can restart the engine. You have to “skip by” Neutral in the transfer case if you want smooth shifts Questions?

Do you need a cable shifter for a jeep?

Even a completely stock Jeep will be happier with this shifter on board. Considered essential for conversions and modified TJ/LJ or XJ/MJ. This cable shifter assembly replaces everything below the factory shift handle, including the problematic z-bar linkage, tunnel mount bracket, transfer case mount bracket and shifter pivot.

What kind of transfer case do I need for Jeep AX15?

If you are working with an NP231 transfer case, you can build it with six-pinion planetary gear sets, a heavier sprocket, and a wider chain to mitigate stress from larger tires and lifts higher than 3 inches.

When did the Jeep AX15 transmission come out?

The AX15 is also known as the AN5/AR5/MA5 in GM and Isuzu applications, and the R series in Toyota Celica and Supra Turbo hot-rods. The AX15 transmission came after the Peugeot BA10/5 and was installed in Jeeps from 1988 to 1999.

Is the AX15 transmission 21 or 23 spline?

The 21 and 23 splined output shafts vary on different transmission models. The AX15 transmission is always 23 spline shaft and extends 1/2″ beyond the face of the transmission. The Torqueflite and NV3550 are generally a flush 23 spline shaft.

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