1.5" is 1.5", no matter how you look at it. Yes the lower gear ratio's have a smaller pinion which is weaker. Not much of a problem unless you are running a heavy truck, 44's, and a lot of stupid pedal. The pinion bearing idea was discussed earlier in the thread. I still call B.S. on that one. I don't think it makes a single difference if you have two pinion bearings or ten. You won't have to worry about that.73k5tony510 said:14 bolt is the way to go.i think but not sure but the 30 spline axles are a little thicker than the 35 spline axles on a 70 also.the extra pinion berring makes it stronger also.the real low gears like 6.17 are not as strong as 4.56 or 5.13.the lower you go the weeker they get.
88-91 G30 SRW (14FF also available)ok in what did chev use a dana 70?
My guess is Dana would build an axle for applications where AAM wouldn't.if the 14 was the best why would they buy dana