Okay. If you can't post and have a discusion like big boys and girls don't post. I was trying to read some of young Averys post about his axle swap. I stopped at the part where he used a carriage bolt for a spring center pin. Where as I don't agree with using a carriage bolt I started thinking more and more on this and I wanted to get "into" it some more. I myself have sheared my fair share of spring center pins. This was brought on by me not keeping the u bolts tight. SO. If you don't keep your U bolts tight you break center pins. Duh. But if the u bolts are tight why do you need a center pin? I don't have the strength numbers but I highly doubt that a 5/16 or 3/8 Grade 8 bolt has anywhere near the shear strength to locate an axle for more than line up puposes. I say the center pin is in place for holding the spring pack together, locate the axle on the springs for assembly and then becomes "not needed" when the ubolts are tight. I think the axle is held in location by the clamping force of the U bolts only. This would bring about the point that a center pin needs only to be a graded bolt. Ie. Grade 5 or better. Discuss like grown ups please.