I'm reaming the spindles on my rear axle for Spicer shafts pulled from a 70. They're a bit under 1.5" at the splines, and turned down to near 1.4" (minor diameter of the splines) along the body of the shaft. I'm thinking that 1.550" should be plenty big enough to allow for housing flex and get oil to the wheelbearings without compromising strength too much. Anyone had problems with that size? Spindles on the 70 are 1.6" ID but these stepuup to a larger OD and use a larger inner wheelbearing; my front spindles are only 1.525" but they ride on torrington bearings at the base and don't oil the wheelbearings around the shaft. What experiences have people had?