I am upgrading my rear suspension on my 96 impala. So far i have bought Bilstein HD rear shocks, UBolt kit from NavyLifer, BMR Rear Extended control arms upper and lower. Now i know its best to extend the driveshaft when installing extended control arms, so i will be getting a P71 driveshaft at the JY today. I have already ordered 1 Spicer conversion U-Joint from Summit. What other parts do i need for the driveshaft?