Hi I’m Ron Bramlett, owner of Mustangs Plus, Inc. in Stockton, CA. In 1999 I ordered a T-5z with a .83 overdrive 5th gear for the use in my #4 Grabber Green fastback. The reason is that the stock .63 ratio is basically unusable in any performance driving. My hat’s off to Bruce for building me such a nice shifting and trouble free transmission.