Differential HD Side Yoke U-Joint Cap Bolts

[Floyd B.]

What would be typical head markings for the bolts that secure the U-joint end caps on a '69 427/390 car? I also haven't been able to find the GM part number for these bolts. I believe the part number of the yoke is 3872922 and the part number of the end cap is 3872909.

Thanx

[Edward B.]

Re: Differential HD Side Yoke U-Joint Cap Bolts

Floyd, from the AIM (UPC L36, sheet B7, item #2), the part number for the bolts was 180126 and it was used on a TON of stuff from the 1940's on! Maybe even earlier than that!

I'm sure most of the vendors sell them, but HERE'S a place that has a really good picture (also attached). However, that's just ONE supplier. There were more as shown in THIS THREAD.

Ed

[Floyd B.]

Re: Differential HD Side Yoke U-Joint Cap Bolts

Thanx Ed, that helps. Apparently 180126 was replaced by 456656.

[Ron G.]

Re: Differential HD Side Yoke U-Joint Cap Bolts

Floyd,

One of the more typical logo's is WB, but there are several that are acceptable such as: TR, M, & A. I like to refer to the logos as the "GM family of hardware". This hardware was utilized throughout the GM line. What is key is that they are grade 5 (3 lines) and are plated silver cadmium. The bolts that attach the wheel hubs on the other end of the half shafts are grade 8 (5 lines) and are plated black oxide. Hope this helps.

- Ron