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i believe the NP231 was stock on 1987-06 wranglers and 1987-01 cherokees, like was was stated before id start with the linkage, but i have my own question, my 97 wrangler says you can put it in 4hi at any time but my friends 88 cherokee says it must be in nuetral to put in 4hi, if its the same transfer case what makes it different?


There is no difference.. In the belief that inexperienced drivers may have the rear wheels spinning in mud and attempt to put into 4hi while one axle is spinning faster than the other axel is why that was inserted in the manual..
All 4x4's can be shifted in and out if both axles are running the same speed.
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