Rebuilt Jeep 231 Transfer Case Wrangler Cherokee Comanche 21 Spline 88-95
The 231 came in many versions, so make sure this is exactly what you need before buying it.
The 231 (Command Trac) starting coming in Jeep in 1986 in the Cherokee, Comanche and 1988+ Wrangler. The original said 231 AMC and was later changed to 231J, but they are the same case.
They had an enclosed rear output shaft up to 1995 like this listing. There is a separate listing for the 1996+ that has the exposed output shaft. These also had different input shafts. This listing is a 21 spline. It was used behind the 2.5 stick, and the early 6 cyl jeeps that had the Peugeot trans. Also used on SOME automatics. The other option is a 23 spline and that came in two different lengths. Another slight difference is the location of the 4x4 vacuum switch. Some are in the front case and others are in the back housing. If you have a preference on that, you will need to specify it. This style will come standard with a front yolk that is threaded for the U joint style drive shaft. It is good to have all the info off the circle tag on the back of the case before contacting us, because it will often tell us much of the needed info.
The 231 came in many versions, so make sure this is exactly what you need before buying it.
The 231 (Command Trac) starting coming in Jeep in 1986 in the Cherokee, Comanche and 1988+ Wrangler. The original said 231 AMC and was later changed to 231J, but they are the same case.
They had an enclosed rear output shaft up to 1995 like this listing. There is a separate listing for the 1996+ that has the exposed output shaft. These also had different input shafts. This listing is a 21 spline. It was used behind the 2.5 stick, and the early 6 cyl jeeps that had the Peugeot trans. Also used on SOME automatics. The other option is a 23 spline and that came in two different lengths. Another slight difference is the location of the 4x4 vacuum switch. Some are in the front case and others are in the back housing. If you have a preference on that, you will need to specify it. This style will come standard with a front yolk that is threaded for the U joint style drive shaft. It is good to have all the info off the circle tag on the back of the case before contacting us, because it will often tell us much of the needed info.
If this is not the case you need, we have many others too.
We can also offer an upgraded rear slip yolk eliminator, if you want to do that for an additional cost.
This DOES NOT require a core, but we would buy your core if you have one.
The 231 is a very popular chain drive transfer case. They use a driver's side front drive shaft and a centered rear drive shaft. They came in Jeep Dodge and Chevy, but are not interchangeable. The low range on all the 231 transfer cases is 2.72-1, but you can do an expensive upgrade and change the front case to get a 4-1 low range. Early 231s from 1988 through 1991 featured a conventional mechanical (cable) drive speedometer output. In 1992, Jeep introduced a three-wire, digital square wave Vehicle Speed Sensor (VSS), in the vein of modern automotive systems. The standard 231 weighs about 70 lbs. Fluid capacity of the 231 is from 1.5 up to 2 quarts. 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.
Identification
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.
There are Chevy & Dodge versions of the 231. The GM versions use a five-bolt front face that is incompatible with the Jeep and Dodge six-bolt styles.
Heavier-duty HD and DHD units are available in ZJ Jeeps and Dodge trucks, respectively. The standard duty OEM 231 transfer cases are capable of transferring from 1600 to 1900 ft. lbs of torque (as claimed by NVG - actual experience puts this number quite a bit higher).