I recently bought an 87 Cherokee 4.0 4x4 which had what the previous owner claimed to be a bad (4sp automatic) transmission. I drove it around for a day and it did seem that it needed replacement. So, I bought a used tranny/transfer case combo which had already been tested and proven to work, and pulled the old one out. I had to install my old transfer case on the new tranny because mine was a selec-trac (NP242) and the new one was a command-trac (NP231). So, I installed the new tranny and hooked it up, and at the same time decided to buy a new front bumper for it (the old one had been in some sort of small collision and was dented and pushed into the frame). As I was installing the new bumper, I noticed that the transmission cooling lines ran right up behind it into a secondary fluid cooler (part of the trailer-tow package), and that they had been smashed flat when the bumper was pushed in. This seemed to me to be a pretty likely cause of the transmission going out, since no fluid could travel through the smashed part of the lines, therefore no cooling. So i installed a new cooler and lines and put the front end back together. I torqued everything down and made sure everything was in place tranny-wise, then filled it up with new fluid and took it out for a spin. When I got to about 35-45 mph, and let off the accelerator, i noticed that the Jeep would feel like it was shifting in and out of neutral (losing power sporadically). This worried me, especially since the new transmission had been proven to work. I messed with the kick down (TV) cable a little, which didnt really seem to help (I don't know how to properly adjust it anyway....the Haynes manual was pretty confusing about this). So I thought that it might be the transfer case, since the new tranny had been proven to work with the one that came with it. I tried driving it around in 4wd Hi (full-time mode) and it actually seemed to do much better. I went in and out of 4wd a few times, and it seemed as if things were almost normal. Then I shifted the case into neutral, and back into 4wd Hi. After that it it all went back downhill. It started doing the same thing it had done at first; losing power and seemingly slipping into neutral. Now it won't shift into 4wd at all, or at least the dash light doesnt come on. Does this problem sound like it makes any sense to anyone? Could it be all just the case, or is it the tranny too? Also, how easy would it be to put in the command-trac case instead? (I really don't want to drop the tranny again...) And, does anyone know how to properly adjust the kickdown cable? If anyone has any suggestions or answers, i would really appreciate it. Thanks.