What is the axle tube diameter of a late 70's 9" axle in a F150 4x4? I need to order some new spring perches, and my tape measure isn't a very precision measuring instrument for this.

 

http://broncograveyard.com/bronco/c-390

 

Thanks Dennis, but I already looked at Jeff's to see if the size was listed. I don't need factory replacements though because I'm using Chevy springs, so I'm going to use custom perches. The ones I want to use will work with the Chevy 2.5" springs that I plan to put on my Bronco. They also have 3 holes drilled to relocate the axle forward/rearward and are 8" long to help control spring wrap. I think the tubes are 3", but I'm not sure.

 

I just bought new u-bolts for my 79 F150, 2wd, with the 9" rear and they are 3.25". I believe they are the same as the 4wd.