[undy]

The TR3550 and 28 splines axles are your weak areas, IMO. I've got a 9" rear and had 28 spline Currie axles in it. Upon inspection both axle ends had a significant twist, one almost to the point of twisting the end off. I went with a set of Dutchman drop-forged 31 spline units. Dump the 3550 too and get a TKO600. If you ever get a good set of sticky tires it'll be toast.