OK, I know we use a Corporate 10 bolt up front and a 12 bolt in the rear, but does anyone know if these are the same as GM 10 bolts and 12 bolts. The reason I ask is because I have been finding these(GM) with thick and thin ring gears, which is what some people in older posts said we needed. I am also unable to find out what size our 10 bolt ring is, because I keep finding GM 10 bolt rings in 7.5", 8.2", and 8.5". Am I way off the mark by thinking we can use GM ring and pinions? I thought I read somewhere that Isuzu was partnered with GM a while back. Could someone also tell me the counts of the pinion splines on each one? I thought I had heard 17 somewhere, but that sounded kind of low so I'm not sure.