Was wondering if anyone knows what size cotter pin for front wheel bearings on 1970 B-Body with disc brakes
There was a 1/8" in there, same size as ball joints use, but it seems I can fit a larger 5/32" in. Or does it even matter?
Thanks, Jeff

I would go with the larger one so long as it fits without having to wrestle it in there. Just make sure it doesn't rub on the grease cap.

The larger 5/32 cotter pin slides in easily, but the loop end won't clear the grease cap. Maybe I'll squeeze the loop end a little in a vice to allow it to go down further.

The strength is more important than the diameter, correct
It is design to keep the nut from moving, correct
I don't even spread the bottoms out anymore It can't bounce out, correct

the only drawback to not spreading the ears, the spindle and nut are stationary, while the hub turns. if [for whatever reason] the cotter pin backs up a tad, it "might" rub against the spinning hub cover, introducing metal shavings into the grease.
i just spread the legs a tick, roughly 1/8", just enough to prevent movement.

Thanks for your replies,
In my never ending quest for knowledge, I found this at work in the machinist handbook. So, if I can fit a 5/32" pin in the hole, a 1/8" is definitely too small of a cotter pin.
I will take a closer look at it this weekend.
Just wanted to share this info