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#1
03-07-2007, 10:17 AM
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wheel studs
Can anyone tell me what the thread was for the 78-80 grand prixs wheel studs?
Is it 7/16, 12mm, 1/2 or 14mm? Thanks |
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#2
03-07-2007, 04:13 PM
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definitely metric, would guess 12mm.
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#3
03-07-2007, 08:29 PM
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The stock studs on my 78 GP LJ are definetly 7/16-20. I know because I just recently got some new lug nuts for some new wheels I purchased. I don't know off-hand if different handling packages were available or if they would have different studs.
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#4
03-08-2007, 09:02 AM
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Gee, I thought this forum had died!!
They went metric in the 80's, but the first years were good ol SAE. |
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#5
03-08-2007, 08:15 PM
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checked my 80 is 12mm metric. even lug nuts are stamped metric.
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#6
03-09-2007, 01:44 AM
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both the 79s i've got here are 7/16"....maybe there was a year-break on this kind of stuff?
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#7
03-15-2007, 02:17 PM
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ahhh--2 choices
I guess my 79 would be 7/16- right? or was that 12mm? I don't have the original lugs, or at least I don't remember where the heck they'd be. I have chrome lugs that have gone bad and would like to replace with new ones. I guess the only thing I could do is find a 7/16 nut and see how it fits? thanks again |
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#8
03-15-2007, 04:12 PM
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1979 are most likely 7/16. Seems like the '80 Lemans I had was also SAE, but it's been 15 years since I sold that car.
I think GM lugs were totally metric by 1981, except for B-bodies and trucks. I've seen some late 80's squad cars (Caprice) that had 1/2 lugs. |
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#9
03-15-2007, 11:54 PM
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Have you tryed calling a auto parts store?
__________________
Cuz68 
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#10
03-16-2007, 05:25 AM
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Too much guessing going on. Guessing doesn't help anybody.
78-81 GP had 7/16" X 20 threads. The lug nut varies whether you have std steel wheel, Rally wheel, wire wheels, or aluminum wheels. |
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#11
03-18-2007, 07:48 PM
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go and look if its metric the stud will have an M on the face. if its sae it wont. also the metric lug nuts will say metric on them
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#12
03-18-2007, 08:59 PM
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here are some pics
Metric |
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#13
03-18-2007, 09:04 PM
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and SAE
hope this helps |
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#14
03-21-2007, 07:14 PM
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as i said, my 1980 are original metric, 12mm
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#15
03-21-2007, 08:02 PM
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Are you the original owner? Seems to me they were changed. The GM parts catalog shows SAE at least through 81.
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#16
03-27-2007, 10:24 AM
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no I'm not the original owner--2nd owner of car
I found out they are 7/16" thanks |
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#17
03-27-2007, 10:29 AM
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no I'm not the original owner--2nd owner of car
I found out they are 7/16" thanks |
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#18
03-27-2007, 07:16 PM
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yes, I am original owner.
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#19
03-27-2007, 07:27 PM
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Engineer... maybe it was assembled in Canada?
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#20
03-30-2007, 01:38 PM
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no, made in arlington tx
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