12-18 Jeep JK Wrangler 2.5-6 inch Lift Front Driveshaft w/Yoke Adapter DynatracThe Dynatrac 12 18 Jeep JK High Articulation Front Drive Shaft is needed when lifting your JK 3 4. 5 inch to prevent vibration or CV bind under heavy articulation. On 12 18 model Jeep JKs this is also required to clear the factory cross member. The Dynatrac 2012 2018 Jeep JK High Articulation Front Drive Shaft is needed when lifting your JK 3 4. 5 inch to prevent front end vibration or CV bind under heavy articulation. On 2012 2018 model Jeep JKs this