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. The new Wrangler (TJ) continues to use the NP231. 1987-95 YJ and 1997-04 TJ Wrangler rear of case has circular I.D. tag. Tag has model number, assembly number, serial number and low range ratio. Some 1987 Wranglers came with NP207.
Your Jeep Liberty goes hard. It gets you out of sticky situations with the power of four-wheel-drive. That's why it is important to make sure your transfer case is in good working order. 4WD.com has all the parts and accessories you need to keep you adventure vehicle slinging mud with the best of them.
How It Works
The transfer case in an all-wheel-drive system has a device that allows for a different speed between the front and rear wheels. This allows the system to function properly on all surfaces. Part-time four-wheel-drive systems are different. The transfer case locks the front axle driveshaft to the rear axle driveshaft. The wheels in this setup spin at the same speed. They should only be used in low traction situations. If your Jeep is left in four-wheel-drive, the drive train will constantly be trying to slow down the front wheels. This will cause stress on all the components and causes binding.
The jeep liberty transfer case splits the engine's power directing it to the front and rear drive axles. As your Liberty increases in miles, the transfer case will eventually need some work. If you are experiencing difficulty shifting gears, grinding noises from underneath the vehicle and it jumps in and out of four-wheel-drive, that time is now. You need replacement parts or a new transfer case altogether. The 2002 jeep liberty transfer case and the 2007 jeep liberty transfer case utilize the NP231 transfer case.
The best way to prevent problems is to check your fluids regularly. The transfer case requires separate fluid from the transmission. It requires automatic transmission fluid as opposed to gear oil. On top of making sure your fluid levels stay high, you should periodically change the fluid in the transfer case. It is a simple process. Locate the transfer case plug. Remove the drain plug as well as the fill plug and drain the fluid into a pan. Replace the plug and refill the transfer case.
4WD.com carries transfer cases, accessories and fluids that all have our Best Price Guarantee. Maintaining your Jeep Liberty is simple and manageable with 4WD.com as a resource.
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