I through a quick email to bds suspension and one to alcan spring to see what they use here is what they had to say:
From: Tjayandlisa [mailto:[email protected]
Sent: Sunday, July 21, 2002 2:12 PM
To: [email protected]
Subject: Rear spring pin
I need to replace the center pin in the rear leaf spring, can you tell me what is the best grade bolt to use? I have herd mixed opions about grade 8 bolts being to brittle, because of the hardening process? Which do you use? Thank you very much... Tjay
You may find this hard to believe, but ours and Original Equipment and almost everyone in the spring business uses grade 2 center pins. You won’t be able to find a grade 5 or 8 anywhere. The softer metal is used so if there is a problem the center pin will stretch a lot before breaking.
Visit BDS on the internet at www.bds-suspension.com
Alcan spring said:
Tjay The center pin is just for locating the spring and the axle at the right point , after that the u-bolts take over . Weather you use a grade 8 or grade 2 if the U-bolts are not tight you will shear center bolts .
Hope this helps ya out....