you shouldnt need to but it couldnt hurt. let me dig through my pics and see if i can find a pic of my old mount, it was setup for a removeable winch place setup but the same idea applies
Edit
Cant find anything =\ but you pretty much have the same thing going as i did on my old truck less the top braces which i think you need since you are running stock spring hangers and theres no good way to brace the under side of the frame from breaking (drop hanger makes this a piece of cake) but id say you are set
