That rearend is perfect for the Piranha as thats what it was redesigned for. I also have any part you need for the Piranha if your looking to purchase some of the more difficult parts.
I have a pair of front A-arms that didnt work for my build as my shocks were further outboard and I made them with 1" .090" DOM tube.
They need the shock mouts but Ill throw them in for damn near material cost if you purchase the rearend unit as a bonus. I am also a FOX dealer. Hell you name it I have it or know where to get it.
Many people on here can vouch for the quality of my work. Become a VIP on the forum and save 10% on all my items excluding the Rearend kit and fox shocks. I also ship for free with large purchases.
Welcome to the site and Thanks for your service! You deserve a smooth going fun project and I know there are alot of us here to help. This is what we do!
Doug Heim