Some 4.56 gear questions!!

As for which one you need, my chassis book is in storage and I have no idea which box. If you have access to a MP chassis book, with your tire height and gear ratio it will tell you which speedo gear you need. If you can't find the correct one on ebay, go to one of the big car shows like Carlisle or MOPAR Nats in the parts area. A lot of people have them laying around in their for sale parts. Most of the ones I bough over the years were from vendors at shows.