Twin I beam factory codes C8TA vs C7TA?

[Billiam68]

I have 2 sets of Twin I beams. The factory numbers are different on both sets I have but everything measures out the same. Is there a way to uncode the numbers?

Set #1
C8TA - 8 B -74B
C8TA - 9 - B 81

Set #2
C7TA - 9A 19D
C7TA - A 26B

Thanks,
Billy

[fordman]

the difference is probably the bump stop for the spindle on the 67 i beanms vs the 68 i beams. unless it is king pin size but yousay you measured it. but usually the king pins are the same size fo ra F100 unless it was a high gvw truck. there is a page on the site with part number and photos of i beams.