2 different sized lugs--frt and back - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hogrocket · 09-09-2006, 02:11 PM

I just received some rims from VTBLAZER and as I went to take of the stock rims I realized the front lugs are 9/16" and the rears are 1/2". It's a 1970 K20 LB with factory disc up front. (disc option is listed on the glove box options list) Has anyone ever heard of this or has there been some kind of conversion done. It all appears to be stock. Thanks Matt

msgross · 09-09-2006, 02:17 PM

you can buy new studs at autozone...

*trkklr77* · 09-09-2006, 02:22 PM

i wonder if your rear axle has been replaced with a 73+

junkyardjohn · 09-09-2006, 03:07 PM

THESE TRUCKS DIDN'T HAVE DISC.S UNTIL 1971. SOMEONE PROBABLY CHANGED IT TO A 73 ON UP FRONT CROSSMEMBER. I THINK ALL OF THE 3/4 & 1 TONS HAD 9/16 DIA STUDS. THEY PROBALY ADDED THIS OPTION TO THE GLOVEBOX OPTION STICKER. YOU CAN BUY BLANK ONES ON EBAY FOR $5.00 & TYPE IN ANY OPTION YOU WANT.

JOHN

LUV2XCLR8 · 09-09-2006, 03:39 PM

Quote:

Originally Posted by msgross

you can buy new studs at autozone...

Agreed, quick fix, and you probably could use them anyways

hogrocket · 09-09-2006, 04:11 PM

Thanks JUNKYARD---your right--I thought they were factory, but looking at the glove box option sticker again it does not say disc--just power booster option. Anyway--that's just one conversion less that I have to do. Thanks again everyone.--Matt

Longhorn Man · 09-09-2006, 09:03 PM

starting in 71, they added disk (as stated above) but that is also when they went to the 9/16 studs. You coupl probably get the rear hubs and drums off a 71 - 72 rear and put them on your truck if it really bothers you.
Just getting studs won't help. you'll need to redrill and spline the hubs, and then redrill the drums too.

Fred T · 09-10-2006, 12:24 PM

Iirc, your lugs should be 9/16 all around. You can replace the rear studs, bit you need a hydraulic press and a drill. For most guys, it's easiest to take the hubs to a machine shop.

An easy fix is to buy some adapter lug nuts. I ran into the same situation when I went to put newer wheels on my 52. My tire shop had some nuts that worked.

Longhorn Man · 09-10-2006, 01:06 PM

swapping over to later wheels on older hubs isn't an issue. The wheel is uhub excentric, so you don't need to worry about centering it, or supporting the weight, and the taper in the lug nut and on the holes on the wheel are the same angle.

09-09-2006, 02:11 PM	#1
hogrocket Junior Member Join Date: Apr 2006 Location: San Diego Posts: 100	2 different sized lugs--frt and back I just received some rims from VTBLAZER and as I went to take of the stock rims I realized the front lugs are 9/16" and the rears are 1/2". It's a 1970 K20 LB with factory disc up front. (disc option is listed on the glove box options list) Has anyone ever heard of this or has there been some kind of conversion done. It all appears to be stock. Thanks Matt

09-09-2006, 02:17 PM	#2
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 2 different sized lugs--frt and back you can buy new studs at autozone...

09-09-2006, 02:22 PM	#3
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 777	Re: 2 different sized lugs--frt and back i wonder if your rear axle has been replaced with a 73+

09-09-2006, 03:07 PM	#4
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: 2 different sized lugs--frt and back THESE TRUCKS DIDN'T HAVE DISC.S UNTIL 1971. SOMEONE PROBABLY CHANGED IT TO A 73 ON UP FRONT CROSSMEMBER. I THINK ALL OF THE 3/4 & 1 TONS HAD 9/16 DIA STUDS. THEY PROBALY ADDED THIS OPTION TO THE GLOVEBOX OPTION STICKER. YOU CAN BUY BLANK ONES ON EBAY FOR $5.00 & TYPE IN ANY OPTION YOU WANT. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

09-09-2006, 04:11 PM	#6
hogrocket Junior Member Join Date: Apr 2006 Location: San Diego Posts: 100	Re: 2 different sized lugs--frt and back Thanks JUNKYARD---your right--I thought they were factory, but looking at the glove box option sticker again it does not say disc--just power booster option. Anyway--that's just one conversion less that I have to do. Thanks again everyone.--Matt

09-09-2006, 09:03 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 2 different sized lugs--frt and back starting in 71, they added disk (as stated above) but that is also when they went to the 9/16 studs. You coupl probably get the rear hubs and drums off a 71 - 72 rear and put them on your truck if it really bothers you. Just getting studs won't help. you'll need to redrill and spline the hubs, and then redrill the drums too.

09-10-2006, 12:24 PM	#8
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: 2 different sized lugs--frt and back Iirc, your lugs should be 9/16 all around. You can replace the rear studs, bit you need a hydraulic press and a drill. For most guys, it's easiest to take the hubs to a machine shop. An easy fix is to buy some adapter lug nuts. I ran into the same situation when I went to put newer wheels on my 52. My tire shop had some nuts that worked. Attached Images __________________ Fred There is no such thing as too much cam...just not enough engine.

09-10-2006, 01:06 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: 2 different sized lugs--frt and back swapping over to later wheels on older hubs isn't an issue. The wheel is uhub excentric, so you don't need to worry about centering it, or supporting the weight, and the taper in the lug nut and on the holes on the wheel are the same angle.

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