WTF! I am sure you guys are correct on the torque spec, but I just busted a bolt! Since my old ones were getting rusty I decided to to replace them with new ones. I bought grade 8.8 (like 5 in English) because one of the original ones broke when I removed it and I was able to drill it fairly easily. Plus a local drag racer I work with said he uses grade 5 on his drag car because grade 8 in too brittle. Yes , they are stronger in the direction of the bolt but shear strength is more brittle. So this would be grade 10.9 in metric I believe. What did you guys use?
I used 10.9 because I believe that's what came out.
I've heard another person tell me the same thing about using grade 5 instead of grade 8 but I think their full of crap. I was told by a "drag racer" to use grade 5 for the suspension control arms and not grade 8. His theory was wouldn't you rather bend a bolt instead of break one?
But, the factory used 10.9 fasteners on all of the suspension components. I'm guessing the GM engineer's know a little more about that than a backyard drag racer.
Your lucky you just broke a bolt. When I torqued mine down, I found the two front locations, #2 position, both broke the cage nuts. :evil: So now I don't have a single cage nut left on the car. Everything has 10.9 fasteners with locknuts.
I looked thru some odd A/G-body information that I have filed in a folder.
Regarding body mount bolts. They claim that there's 3 different size bolts.
Position- 1 uses p/n 10049638 (2 needed) 12 x 1.75 x 95mm long. 95mm is not common so you have to use 100mm. Also nuts needed. * I think I used 10mm x ? bolts & nuts. . It's been a number of years.
position- 3 uses p/n 14085301 ( sold in packages of 5, 2 needed) 10 x 1.50 x 55mm long.
position- 2, 4, 6, 7 uses p/n 3524497 (sold in packages of 5, 8 needed) 10 x 1.5 x 80mm long.
I've bought some of these bolts at my local GM dealer. They weren't cheap. Fortunately, several of the bolts that I removed were in like new condition, so I reused them. shhhh!
As for the hardness, I wouldn't use anything less than 10.9 . If you look around, I'm sure you can find them aftermarket.
A guy over at Maliburacing, a few years ago was selling bolt sets for like $15.00. It was a good deal at the time.
GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.