Does anyone know what the bolt size is for the single bolt on the lower control arm for a 2006 2LT? I went to change that today since the bushing is shot, and I didn't have a socket of the proper size. I need to go buy one tomorrow. Thanks.

 

I recall it to be a 7/8

 

I think it's actually a 13/16" - as per https://www.chevyhhr.net/forums/how-...ol-arms-44378/

A 7/8" 6-point would probably work in a pinch.

 

I'll double check and get back to you, it could be 21 mm also.

 

Well, yes it is a 13/16!!

 

I'm sure all our HHR nuts and bolts would be metric.
And all of us old wrench turners know that some metric sizes and "American"
ones can be close to interchangeable.

A side note. I can't figure out why GM decided to put a few of those oddball 18mm bolts on the HHR.

 

Well FMG , I went back out and double checked, 13/16 12 point fits, tight and snug, 21 mm 6 point fits a little looser , my 7/8 6 point is very loose on the bolt head and might slip and round the corners so please don't use that one!!!

 

I did the same thing with the same results. Although I didn't even try the 7/8 cause I knew that would just be a nut head rounder.

 

Yeah, that one had me stumped for a few minutes while I scrounged around all my sockets. Glad we got it straightened out.

FMG - did you ever figure out how to get that cover put back in place on the trans?
edit: ahhh I see you did get it done!!!! Dare I say... "Good job"?

 

It is the same socket as the wheel lugnuts. Well, maybe the other end of the socket. I have a "universal" impact lug socket.