Apologies for a very Jeep-centered question, that may not interest everybody. Here goes:
I own a 2009 Wrangler JKU (pre face-lift), equipped with the 2.8 TD engine, Chrysler NSG370 six-speed manual transmission, and the NV241 transfer. The transfer case is directly mated to the gearbox.
This transfer is a part-time 4x4 system: the vehicle is most of the time in rear-wheel drive. When the front axle is connected, it turns at the same speed as the rear axle, which is fine on slippery surfaces and in straight lines, but quite bad when going through curves on dry roads due to transmission build-up.
Other Jeep models have full-time 4x4 transfer cases, such as the NP242 from the Cherokee XJ. These allow some slip from front to back axle, and can more easily be used in situations where one is constantly going from dry asphalt to wet snow and back to dry, often found in mountain driving in winter.
I am looking for any advice as to whether a NP242 would be a drop-in replacement for my NP241. Specifically, I am thinking of not having to modify:
- Chassis supports and general shape of the T-box (the swap should not be immediately apparent).
- The number of splines on the clutch output shaft (I think 23 splines?).
- The reduction ratio, 2.72:1 is fine for my purposes (no rock-crawling).
Otherwise, a transfer case from a Grand Cherokee WJ would probably be easier to source from the breakers where I live. Any ideas on which T-case would fit the JK?