Yeah 87 was a split year for the 207 or 231 t-case. The 207 isn't a bad case, just a one off deal. Chance's are in favor of it being the BA tranny. It's not if they will break, but when and they are expensive and not worth rebuilding. It will be a great time to install the AX-15. When I purchased my 87 with a 120,000 miles on it, someone had allready swapped in the AX-15. With the BA, it'a just a matter of time. Just driving down the road the t-case don't usaully start makeing noise, tranny's do.
1987 wrangler, 258 I-6, 5-speed.
2007 liberty sport 4X4, automatic
2009 ford ranger 4x4 FX4 OFF/ROAD, 5-speed