Your Camaro has a 8.5 rear end, not a 10.5. If you remove the ring gear from the differential it will be a lot easier to remove and install the S spring. I use Channel Locks to compress the spring and push it back in between the axle gears. Tory has new clutches and shim sets for the 8.5 Traction Lock differential. Set up the clutches just like the Eaton Posi. The Tom's Differentials video explains how to shim them.