ok at 335000 2ed gear finely went out of my automatic trans so traded a 95 for a 1988 and found out after reading the 87 came with a new process 207 tranfer case . Mine in the 87 is still good but the 1988 came out with a new process 231. what the difference between the 2 and your thoughts stay with the 87 207 or go with the 88231?