If you want to install a modern overdrive transmission in your classic car, sometimes you’ve gotta cut. We understand that the task of hacking into the floor or firewall of your prized possession can be a bit nerve-racking. Our goal is to make sure that the job of installing a Tremec TKO or T-56 Magnum transmission is as simple and straight-forward as possible. In the video below, our engineering team walks through the process of opening up a 64-66 Ford Mustang trans tunnel in order to make room for a TKO 5-speed transmission. From laying down the template to patching up the project, this clip should help to calm the fears of those who want a few more gears.