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Old 07-16-2017, 08:52 PM   #1
64GMCpickup
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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
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Old 07-16-2017, 10:49 PM   #2
ImpalaJim
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Re: 8 lug to 6 lug 64 GMC, also V6 to V8 swap

well 6 lug is not 3/4
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Old 07-16-2017, 10:57 PM   #3
DPowers
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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
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Old 07-18-2017, 05:37 AM   #4
64GMCpickup
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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 ??????
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Old 07-18-2017, 11:53 PM   #5
Captainfab
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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.
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