8 lug to 6 lug 64 GMC, also V6 to V8 swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

64GMCpickup · 07-16-2017, 08:52 PM

I have a 64 GMC with 8 lugs and want to convert the front drums to disc.
I am installing a 6 lug Posi rear end (I already have it).
So, I need to install matching 6 lug discs in the front. Can I obtain parts from a newer model for a bolt on conversion? I would like to keep it as a 3/4 ton truck.
On another topic, are there bolt on mounts available for swapping the 305 V6 to a 350 V8? I would like to install the V8 and 700 R4 (I already have them).
Any thoughts you guys may have on this would be gratefully appreciated.
Thanks,
Steve

ImpalaJim · 07-16-2017, 10:49 PM

well 6 lug is not 3/4

**DPowers** · 07-16-2017, 10:57 PM

Welcome to the site.
FAQ section should give you all the info you need.
http://67-72chevytrucks.com/vboard/s...d.php?t=646002

64GMCpickup · 07-18-2017, 05:37 AM

I am trying to match the 6 lug axels on the posi rear end. I would guess it would be rated as a heavy half ton ??????

**Captainfab** · 07-18-2017, 11:53 PM

All GM 1/2 tons from '55-'70 were 6 lug. There was no such thing as a heavy 1/2 ton back then.

To change a '60-'66 3/4 ton to a 1/2 ton, you will have to change the entire front suspension including the crossmember from a '71-'86 C10 or a '87-'91 R1500. Then you will need the aftermarket 6 lug rotors.

07-16-2017, 08:52 PM	#1
64GMCpickup Registered User Join Date: Jan 2014 Location: Covington, WA Posts: 7	8 lug to 6 lug 64 GMC, also V6 to V8 swap I have a 64 GMC with 8 lugs and want to convert the front drums to disc. I am installing a 6 lug Posi rear end (I already have it). So, I need to install matching 6 lug discs in the front. Can I obtain parts from a newer model for a bolt on conversion? I would like to keep it as a 3/4 ton truck. On another topic, are there bolt on mounts available for swapping the 305 V6 to a 350 V8? I would like to install the V8 and 700 R4 (I already have them). Any thoughts you guys may have on this would be gratefully appreciated. Thanks, Steve

07-16-2017, 10:49 PM	#2
ImpalaJim Registered User Join Date: May 2014 Location: Kewanee IL Posts: 283	Re: 8 lug to 6 lug 64 GMC, also V6 to V8 swap well 6 lug is not 3/4

07-16-2017, 10:57 PM	#3
DPowers One foot in front of the other Join Date: Aug 2008 Location: Parrottsville, TN Posts: 5,422	Re: 8 lug to 6 lug 64 GMC, also V6 to V8 swap Welcome to the site. FAQ section should give you all the info you need. http://67-72chevytrucks.com/vboard/s...d.php?t=646002 __________________ DP's 66 Build http://67-72chevytrucks.com/vboard/s...d.php?t=361556

07-18-2017, 05:37 AM	#4
64GMCpickup Registered User Join Date: Jan 2014 Location: Covington, WA Posts: 7	Re: 8 lug to 6 lug 64 GMC, also V6 to V8 swap I am trying to match the 6 lug axels on the posi rear end. I would guess it would be rated as a heavy half ton ??????

07-18-2017, 11:53 PM	#5
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	Re: 8 lug to 6 lug 64 GMC, also V6 to V8 swap All GM 1/2 tons from '55-'70 were 6 lug. There was no such thing as a heavy 1/2 ton back then. To change a '60-'66 3/4 ton to a 1/2 ton, you will have to change the entire front suspension including the crossmember from a '71-'86 C10 or a '87-'91 R1500. Then you will need the aftermarket 6 lug rotors. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

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