NEED HELP control arm bolts loosening

[greggraves]

I have 2006 Trailblazer LS 5.3L. I had new struts installed when I left FL. In OR I luckily noticed that the right side rear top bolt was sticking out by almost 2 inches. I managed to get it back in with a pair of channel locks, then took to a shop to have tightened properly. A week and half later the top bolts front and back right side were loose again. How can I fix this? Oregon is not a place you want to run off the road!!

What about Permatex threadlocker red? If that is maybe good idea, should I just loosen the bolt part way out and coat it? Or should I take the bolt out all the way (car won't collapse?)?

 

[littleblazer]

The torque spec on those bolts is something like 200+ ftlbs iirc.

 

[Mooseman]

I don't think it's that much but red threadlocker would make it near impossible to remove without heat. Blue for this type of application should suffice.

 

[Mike w]

The bolt is a 21mm i had the same issue and changed the control arm and it didn't back out anymore.

 

[murdog]

I am having the same issues with sway bar end links. Blue thread lock will do, and if there is enough room (I dont remember if there is since it has been a while since I Changed my control arms and mounts) I would put a second nut on it to lock it.

 

[littleblazer]

Oops. I thought you were referring to the lower control arm bolts. My bad.

 

[murdog]

Oops. I thought you were referring to the lower control arm bolts. My bad.

As was I...
You can still try to double nut them. But blue thread lock should work.

 

[07TrailyLS]

NorcalSS states to hand tighten your upper control arm bolts and check them every oil change. Sure it's for modded uppers but stockers can't be any different

 

[coolasice]

Tighten
Tighten the upper control arm mounting bolts to 146 N·m (108 lb ft)

 

[Mooseman]

And do it with the wheels on the ground with full weight on them. This will properly position the bushings.