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Old 09-04-2015, 09:13 AM   #1
Ricks1971
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2 sizes of lower A arm ubolts?

Getting ready to put the lower A arms on my 67 and noticed that I have 2 different size ubolts? Where can you get the right size ubolts? thanks Rick
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Old 09-04-2015, 10:37 AM   #2
chevy_mike
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Re: 2 sizes of lower A arm ubolts?

I recommend upgrading to the larger '73 and later versions. They are beefy 9/16" u bolts that eliminate the breaking issue GM had with the smaller ones. You just need to drill out your bolt holes in the crossmember.

Search for Dorman 13503 for the larger ones. Amazon has them as most parts stores.
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Old 09-04-2015, 12:34 PM   #3
michael bustamante
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Re: 2 sizes of lower A arm ubolts?

the 67/72 three quarter ton lower control arm bolts were larger as well
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Old 09-06-2015, 08:41 AM   #4
Ricks1971
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Re: 2 sizes of lower A arm ubolts?

I was able to get the bigger bolts from my local chevy dealer. the part number is 345970
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