I recently received a nearly free XJ. It molested a cow @ slow speed and needs some eye shadow but I am looking for AW4 transmission answers. According to the previous owner it quit shifting. He install 1 used trans, then 1 rebuilt, then a new computer under and then it started shifting again. After a wile the shifting stopped and another puter was installed. Now the shifting has stopped and it is mine. I discovered that it will shift manually. Before i dive in head first are there any suggestions on a starting point. As it sits there is a freshly rebuilt trans and at least 1 new computer. The owner didn't know witch computer was replaced the one under the dash or the one under the back seat. I have done nothing yet and breathlessly await your input.