Drag racing consistency starts here: S550 and S650 Mustang Solid Axle Conversion

The best part of this kit isn’t just “solid axle.” It’s the geometry. SPE’s cradle is designed to give you a true triangulated 4-link using Foxbody-style components, while keeping install points clean by using the factory IRS mounting locations. Built from chromoly and TIG-welded in-house, it’s meant for serious power and repeated abuse. The only chassis tie-in recommended is 4 bars to the main hoop for high-hp cars—everything else is designed to support itself. You’ll need to cut the rear floor for clearance… but that’s race car stuff.

Check It Out:https://www.spemotorsport.com/products/spe-motorsport-s650-mustang-external-catch-can-kit-copy

This is the cleanest way to run a solid axle in an S550 or S650 Mustang while keeping proven geometry, class-legal, and easy to service. 
No better option for drag racing!