I guess that you missed the part about 3.54 to 7.17. The 3.08 gears are for a 71, not a 70, they have different offset for the lower gear. I run Dana Spicer gears for everything, if it needs anything extra strength wise, I can get them cryo'd for about $150 no progear necessary with a 10.5" ring gear. You can get a bearing cap support cover, that is about it for aftermarket in a car if you worry about it. Tim