Bolt Size Question

[ls1_monte]

what size bolts are the front control arms?

Front lower control arms, ea. side takes
1 - M12 x 100mm (factory bolts were 95mm)
1 - M12 x 110mm
2 - M12 Metal locknut (not the plastic lined ones)

Front uppers, ea. side takes
2 - M12 x 66mm Serrated shank just below the head (GM Part # 461854)
2 - M12 Metal locknut (not the plastic lined ones)

All are 1.75 pitch and 10.9 grade

 

[ssn696]

Here is the list of metric serrated flange head bolts from McMaster-Carr. I did not yet change these on my Malibu, so I do not know the correct size, but I suspect they will be M12 1.75 as well. Maybe 50 mm?

 

[ssn696]

Hmmm. 66mm. GM it is.

 

[ls1_monte]

Its serrated kinda like a wheel lug is but with a hex head, not sure if I'm describing that well. When you take the nut off the bolt will stay in place, i suppose t makes it easier for shim install/removal.

 

[ssn696]

Ahhh. Splined like a wheel stud. If the factory one is not spinning, it will probably work just fine. The offset 'problem solver' upper control arm shafts will help aid negative camber without a huge stack of shims.

 

[ssn696]

Ahhh. Splined like a wheel stud. If the factory one is not spinning, it will probably work just fine. Use 'problem solver ' upper control arm cross shafts in your rebuild, and you can hit more negative camber with smaller stacks of shims.