Mini-spools are really made for dirt track racing cars. A full-spool is much stronger but not really suitable for street use. There really isn't much you can do for a 7.5" rear axle assembly because they are built light; everything, the ring/pinion, carrier, spyder gears, avle housing and axles are really small. If you have any kind of performance engine and want to hook up your G-Body hard, sooner or later you will have to upgrade to a stronger rear axle assembly.