Why?

 

Post pics of the sheared bolt faces. I'm a mechanical engineer and I can tell you why/how they failed. My guess is fatigue from not being torqued down correctly. And with the pictures of each bolt note in what position it was in relative to the others.

 

^^^ have you ever seen what stacked blocks can do and bend u bolts and cause all sorts of damage?

 

I would also go with lose lugs. Only takes one lug to be lose to eventually cause the others to get lose.

Once on stud snaps they all go.

 

So if your wheel went that far, Where did your rotor go?

 

what do you guys suggest torquing the lugs down on 35's.. i torque mine down to 110lbs

 

i dont know about this. i see cars rolling around all the time missing one or more studs. on a 5 lug i would be comfortable driving around with 3.


but seriously go talk to that tire shop. i know at mine if we were the last ones to work on a car that loses a wheel it would be a BIG deal and the shops insurance covers all repairs. we are competent though and this hasn't happened.

 

Pics of the bolt faces?

 

5 lug is always 100 ft/lbs

 

well than.. i have been over tourqing by 10lbs.. how bad is this?

 

i dont see anything wrong with it.

it has to do more with the lug size and strength, bolts and nuts can only me tightened so tight or they will strip or break.

 

thats whats specced for our trucks yes.

i torque mine to 110, dont see any problem with it.

f-150s torque specs are 150 (maybe 140) but on some trucks in some years, i forget which, they use smaller 12mm studs that are only supposed to be torqued to 100.

x2 on pics of the broken studs. they appear to still be on your truck in one of the pictures. im not an engineer but it should be real east to see what happened

 

Better over 10 lbs than under 10 lbs.

Fatigue in metal is increased when you increase the % change in the loading. The reason that you need to torque the lug nots is because you want to pre-load the bolt much more than the loading that it will see on the road, i.e. the percent change as you are driving is small. Small percent changes in loading = long fatigue life. If you cut the pre-load in half, the road loads would be the same but the percent change in loading from the loads will be double what it was before. This will increase fatigue and decrease the life of the bolt. You can see how a couple of lugs not installed with the correct preload could have caused this whole thing. FATIGUE.

Pics?

 

100 ft lbs. Tire size doesn't matter when it comes to the torque spec
IIRC, my 08 F-150 lug nuts are supposed to be torqued to 118 ft lbs.

 

hmm. if its a 14mm stud it should be 150 ft lbs. or thats what discount tire uses in its stores atleast

 

Call a local dealership, they'll tell you what the torque specs are.

 

After searching i've seen 100 ft lbs and 150 ft lbs. Where's Justin? He can look it up.

 

You could always torque to les-schwab specs. Hit it with an impact until it won't move, wait a minute, hit it with an impact again until it won't move, hit it with the torque wrench until it clicks and then put all your weight on it until you can't move it, and repeat.
I can't count how many times I saw that and complained to management at different stores. It was like they had zero training, I mean how hard is that job? lol

 

That sucks man

 

haha no kidding! good to see people from around my area! haha

 

Happy i have 7 Lugs on my f150

 

I always use a 100 ft lb torque stick on an impact to do mine. Much easier when installing. If it's a torque stick we don't have that's when I get the torque wrench. It's a ***** doing an 8 lug truck but you gotta do what you gotta do.

 

I cant get a pic of the sheared lugs because theyre with the truck. but the damage is: new brakes, new axle, and a new rim. Id do it all myself, but the cost to have my truck towed back home would defeat the savings.
If asked 2 different sources now and they both have said loose lugs.... 3 sources including the forum. so once i get the truck back im going to contact the guy i took it too to have my tires put on and hopefully get this taken care of. at least half the cost... my brakes were already bad so ill have to subtract that.
the wheel went far but the rotor got wedged into the housing and got stuck until the tow truck came and dragged it up the ramp, then it fell off.
I just hope the impact of the axle didnt eff up my gears...

 

After the shop installed the wheels on the truck , did you follow the fine print and recheck the lugs at 100 miles ?l. If not then don't blame the tire guy. Every tire shop I've ever been to has the statement on the bill .Lugs can loosen in 100 miles and should always be checked.

 

This is actually pretty common on half-ton Fords with left hand rears. Had it happen to my Bronco, and I know 4 other people that had the same thing. Did you have those tires put on not long ago?


Edit: Just read that you did. Had mine happen a couple thousand miles after my 36's were put on