The sound of crunching metal as you shift gears on your heavy-duty truck means that heavy load is going nowhere fast. You need some replacement parts for your Ford 5-speed transmission or maybe even a complete unit. If you enjoy racing, there are super heavy-duty Ford 5-speed transmissions for 5.0 liter Mustangs that offer more power than you get from stock parts. They feature improved bearings and synchronizers, as well as carbon fiber blocker rings. These transmissions are direct replacements for 1979 to 1993 Mustangs, including the GT and SVT Cobra models. If you have an F-250, F-350, or F-450 gasoline or diesel truck dating from 1987, you may need a Ford ZF 5-speed transmission. However, when you install the sparkly new part, it does not mean that you have to overuse the fifth gear. If you want to load your Ford pickup to its maximum capacity, it may be better to use the fourth gear to keep your transmission temperature cooler, sometimes by as much as a massive 100 degrees Fahrenheit. This extends the life of your truck's transmission. Whether you need a Ford Ranger 5-speed transmission or a Ford 5-speed transmission for another vehicle, find it in the large inventory on eBay.