Ordering A New ShaftInland Empire Driveline and Mustangs Plus keep ready-to-order driveshaft assemblies on the shelf for most Mustang applications. Inland Empire Driveline can make a custom driveshaft if you follow the proper measuring instructions on its Web site. Measure "X" from the rear axle yoke to the tip of your transmission tailshaft housing with the rear suspension at normal ride height. Allow "Y" distance for slip-yoke travel-normally around 1-1/2 inches of exposed slip-yoke from where the yoke meets the universal joint to tailshaft seal. Be specific when you order, including universal joint dimensions at both ends.
Another important thing to remember is to keep your driveline parallel, which means each end of the driveshaft (both yokes) should be parallel at all times. Odd angles will cause vibration and failure. Pinion and rear universal joint angle should be at the same number of degrees as the front universal joint for smooth operation.
Tube diameter depends on application. Here's how Mustang steel driveshaft tube sizing from the factory works:
Tube diameter and material thickness increase for aluminum shafts. Aluminum driveshafts aren't suggested for every application. Opt for one in a six-cylinder or small-block, while steel is suggested for big-block Mustangs. For those with healthy budgets and imagination, Inland Empire Driveline can build a composite shaft that's even lighter than aluminum. It also looks high-tech for your restomod show car.