I just recently bought my 91 XJ. I freaked out the day after I bought it, becuse the key vibrated out while driving. I parked it, and just turned it on without the key. Where I live, I knew I had to have it fixed, or file a police report for a stolen XJ. THEN..........I parked it again, and gave the gear selector a little push when putting it into park. Once it clicked, the steering locked and it wouldn't start with out the key. Try it before you spend any $$ on a new assembly.