Trying to get your front driveshaft lengthened in your L5P Duramax can be a headache when you lift your vehicle over 7". Cognito has the answer. This lengthened front driveline will work on 7-12" lift kits. Built using a 1310 series double cardan CV this is a direct bolt on driveline made right here in the USA, and even includes Cognito's Allison Transmission Bracket.