To toss this out there..I've seen this a number of times working with Mechanic Dan. It'* not necessarily due to the torque and power. GM designed these in a way that this does occur on an everyday stock NA as well. It'* not overly common that it happens on nearly every car..but it'* along the lines of breaking an endlink. Over time the constant pounding the tires take from bumps and turns can do this very thing.

I don't believe you have any worries if you replace the bolt with the proper bolt as GM intended.

Odd that we've never seen it on an H body in 5 years here though, huh?

Yes..and I'm surprised Don hadn't seen it a few times.

It'* fun to get that nut with stuck part of bolt out isn't it. Makes you want more air pressure and a mechanics air chisel. Same way I've taken a couple out.

Overall though, what I was trying to convey is that you shouldn't see a recurrance/ongoing issue from that bolt shearing. Most likely the other loose bolts aka flexible area put more stress on this bolt and caused it to snap.

Didn't Cheetah have this same problem :?

Cheetah never had the problem, and I know exactly when this happened. It was a hard launch at woodburn, because as I was braking after that run, I noticed my steering out. You were at the track that day, Bill.

Again, odd that we've never seen it on a Bonneville with over 8000 members, probably 9500 cars, and over 5 years here? Neither Don nor I, who have collectively read every mechanical topic here?

I don't think H bodies are prone to this at all.

unless im confused or reading wrong..

But isn't this the same problem
http://www.bonnevilleclub.com/forum/...ic.php?t=64915

Well there'* one I missed. I have no idea how that one slipped by me.

My point is though, that it WAS a hard launch that sheared ths one off. But only one of them.

This wasn't normal daily driving. And Cheetah had some pretty severe alignment/handling issues for quite some time that probably stressed his.

but could it also be that yours got loose and then from the hard launching it broke the bolt?

Considering they had been tightened less than 1000 miles before that, I don't think so.

I would be questioning how those other two bolts if torqued to spec became this loose.

We know of other cars putting down more power without rack bolts snapping. While we haven't seen much here on the club, it is something that does happen and can happen. Maybe the world was on the right rotation for your bolt to break.

My point is simply that in my opinion if you replace the bolt with the proper one and check torque spec on all the bolts you should not see this issue again.