The silver ones are listed as 1.34 long the black ones are listed as 1.37 long.
Both are listed as 5/16 - 24 thread...

I am looking around. I found the new straps I have but not the bolts.

 

Here is a used one. I will have to verify the threads tommorow if I remember to take it with me

 

This is what I have but the pitch measures ~0.042" and length under head about 1.305" and diameter 0.308". So yea basically the 5/16-24 bolts but the 10.9 on the head is throwing me off. Really close to a M8x1.0 but not exact...

 

strange indeed...

 

I wonder if those were replaced at some point ? None of the GM bolts i could find are fully threaded like that.

 

@Atomic hey ***** Stick is this the first one you built for your first truck???

If so you didn't get straps so you bought some Jankey aftermarket stuff. That's why you can't figure it out...

https://www.performancetrucks.net/fo...f-swap-441553/

 

@Atomic don't pretend your sleeping now...

 

No that was my other truck, I replaced them when i regeard it for this truck in 2011.

 

I went through that build and only see you mentioned re gearing it. No mention of replacement hardware for the yoke....

Confirmation of the 24TPI and comparison of a 1.0 and 1.1 threads for reference.

 

One of those thread gauges would be handy