I can't find what size -bolts i need... It's from an '01 Ranger if that matters, I don't think it does. In the tech library I see the 31 spline 8.8s have 3 1/4" tubes, but I know the 28 spline axles taper towards the end. I though the taper was after the spring mount, but I ordered some 3 1/4" bolts and they are way too big...