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Mod | | | Forums66 Topics128,012 Posts1,055,318 Members48,419 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | What is the typical size and thread of the wheel studs on a stovebolt? Did GMC ever use bigger ones? | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy bigbadswingdaddy, what size of truck are you asking about? | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | 1/2 ton or 3/4 ton. Mine is a 6 lug 3/4 ton 1940 gmc. i was wondering if it would make a difference with the stock wheels if they were bigger. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Typically, pre '70 1/2 tons had 7/16" studs, with 3/4 ton having 1/2" and 1 ton with 9/16". It can make a difference with the wheels if the studs are larger in diameter, thenut seat may not fit correctly on the wheel, and will give an incorrect torque reading. The lug nut seat can be modified with a 60 degree countersink bit, you just slowly machine the seat to the correct size. I have done this on the Blazer ralleys that I have on my '55, no problems at all. I had to do it beacause I installed 1/2" studs in place of 7/16". The same procedure can be used to repair damaged lug nut seats too.
Bill Burmeister
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