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Author Topic: 1978 Chevy Truck lug nut size  (Read 16403 times)

Offline wideboots

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1978 Chevy Truck lug nut size
« on: March 21, 2006, 03:40:00 pm »
OK, so this is going to be a dumb question from a Chevy Truck owner - what can I say. :rolleyes  I am about to buy a very expensive set of new wheels for my truck.  I think the lug nut size is 7/16" but my mind has gone blank.  The truck is in the paint shop so it is not available to me right now.  The truck is a 78 1/2 ton step side with factory stock disk brakes in front.   Better brakes will come later especially on the rear. I know the bolt circle is 5" because I checked that.  It is called a 5 on 5 bolt circle I believe.  Now please let me know if the stock lug nut size is 7/16 then I can place my order for the wheels.  Thanks a bunch guys.  Without you I would be in serious trouble with this truck project.  

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Offline VileZambonie

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Nuts
« Reply #1 on: March 21, 2006, 09:17:00 pm »
I believe you have 1/2" lug nuts. 7/16 were used on the 6 lugs I'm pretty sure...

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Offline 81ChevyCheyenne

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Re: Nuts
« Reply #2 on: March 23, 2006, 01:37:00 pm »
Out of 1981 Service Manual

K - 7/16" Bolts (6)

C10,P10,G10,G20 - 1/2" Bolts (5)

C20, P20, C30,P30 and K20,G30 Single Wheels 9/16" Bolts 8

Hope this helps as this is a 1981 Manual

81ChevyCheyenne

Edited by: 81ChevyCheyenne at: 3/23/06 1:38 pm
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Offline wideboots

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Re: Nuts
« Reply #3 on: March 24, 2006, 07:30:00 pm »
Should be the same, plus I verified the size with the Chevy parts man just in case.  8)  Thanks for the input.  

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