So I am actualy posting this for my dad his xj all of a sudden won't shift Into passing gear it was absolutely fine then all of a sudden starting acting this way he's ran through all the vaccume lines and replaced some cracked/broken ones there's a vac line that runs to the tranny and he said it was in good Condt no breaks or cracks what could be keeping it from shifting is it a throttle cable adjustment or something ? PleAse help he's trying to go camping with the jeep in a few days. Your input would be greatly appreciated! Thanks . Happy trails!