93-95 lack the ability to lock the center differential in 4 low, while a revised version in 96 changed this. This makes for very efficient, and very effective full time operation. The 249 utilizes a vicious coupler used in conjunction with the center differential found in the 242. NP249: Full time transfer case used exclusively in 93-98 ZJ Grand Cherokees with 4 full time and 4 low. The 4 full time feature is unique from the NP249 as it does not use a vicious coupler (what goes bad in the 249), but instead a mechanism that operates similar to an open differential. 2wd, 4 part time, 4 full time, and 4 low. NP242: Full time transfer case used in XJ's and ZJ's.
NP231: Part time transfer case used commonly in XJ's, YJ's, TJ's, ZJ's, etc. Here's a quick run down on the three ZJ transfer cases: If those things aren't a deal breaker for you, replacing your VC and giving new life to your 249 is a good option, but for most of us, we're more inclined to swap. Many don't like the fact they are stuck in 4 wheel drive, and the inability to lock the front and rear axles together in 4 low with the early 249 is a deal breaker for many. As you may already know, the VC itself is very expensive. So why swap if you could just replace the VC? Good question. It is actually very durable and it's AWD performance is excellent even with today's standards with a properly working VC. Contrary to popular belief, the 249 is NOT "junk", nor is it a "bad" transfer case.
The main cause for these problems? The vicious coupler (a sealed unit with steel clutch plates submersed in a vicious fluid) has reached the end of it's service life (typically 150,000 miles or so). It also has a shorter and stronger main shaft design.If you're here, you probably have a ZJ with a 249 (full time) transfer case and you are experiencing issues such as hopping around turns, tire screeching, uneven tire wear, and possibly much worse issues. This reduces the angle of the dive shaft and in turn improved bearing and u-joint life, reduces driveline vibrations caused by lifted Jeeps running short drive shafts. The main advantage to the new Mega Short SYE kit is that it allows for a much longer drive shaft to be used (additional 3 inch ). The Mega Short SYE (18676.72) is designed to be used in the same lift applications as the other standard SYE kit (2 inch and up). This is the most complete and strongest kit available. The purpose of this kit is to replace the slip yoke portion of the NP 231 with a fixed yoke and CV-style drive shaft assembly. A Slip Yoke Eliminator Kit (SYE) will eliminate the need to drop your transfer case in order to avoid drive train vibrations that are caused by taller suspension lift. The kit fits all newer production NP 231 transfer cases (1987- up). This kit is a MUST if you installed a 2 inch or taller suspension lift in your 1987-2006 Jeep Wrangler (not needed for body lifted Jeeps).
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