Lug nut thread size?
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Joined: Jul 1999
Posts: 17,265
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Most if not all third gens are 12mm x 1.5. I'm not sure the exact year GM switched to metric wheel studs. The pre metric studs will be 7/16" NF
Joined: Sep 2005
Posts: 27,893
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Stephen is exactly right. I think "someone" is mistaken.
You can look them up in the lug nut section of AutoZone or some such, basically anywhere that sells wheels.
You can look them up in the lug nut section of AutoZone or some such, basically anywhere that sells wheels.
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iTrader: (1)
Joined: Jul 2004
Posts: 10,763
Likes: 4
From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
my '82 TA uses metric lugnuts as well, I think the studs and nuts are stamped "metric".
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