| Brake drums [message #261843] |
Sun, 14 September 2014 11:51  |
Harry
Messages: 1888
Registered: October 2007
Location: Victoria, BC CANADA
Karma: 3
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Do you know if NAPA #640-1225 brake drums will fit on our GMC?
Thank you.
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| Re: [GMCnet] Brake drums [message #261899 is a reply to message #261843] |
Sun, 14 September 2014 20:22  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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We have looked at 640-1225 before here on the GMCNet and they are not currently on the napaonline.com site as an available part. The rear drums on the GMC are a special and available from Jim K or Cinnabar. I can call my local NAPA guy tomorrow and see if they show up on the direct computer and see what info he can did up.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Sep 14, 2014, at 12:51 PM, David H. Jarvis wrote:
> Do you know if NAPA #640-1225 brake drums will fit on our GMC?
> Thank you.
> _______________________________________________
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Brake drums [message #262000 is a reply to message #261899] |
Mon, 15 September 2014 21:43 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Let us know if they do fit.
Sent on a Sprint Samsung Galaxy S® III
-------- Original message --------From: Larry Date:09/15/2014 9:21 PM (GMT-06:00) To: gmclist@temp.gmcnet.org Subject: Re: [GMCnet] Brake drums
Harry wrote on Mon, 15 September 2014 16:32
> Larry wrote on Mon, 15 September 2014 11:48
>> Harry wrote on Sun, 14 September 2014 11:51
>>> Do you know if NAPA #640-1225 brake drums will fit on our GMC?
>>> Thank you.
>>
>> So, why are you looking for drums? What is wrong with yours?
>
>
> I saw a new pair of 1 ton drums for sale locally and if they would fit I would buy them.
AHH....Ok, good plan. Hope they fit.
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Brake drums [message #262010 is a reply to message #261924] |
Mon, 15 September 2014 23:58 |
Adrien G.
Messages: 474
Registered: May 2008
Location: Burns Flat, OK 73624
Karma: 1
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Les,
To me they look like the 66 Toro front drum (with diff bolt pattern and maybe the bore), the front drums and they where wider then the rear and they used wider shoes also.
I wander if GM started the coach with 3" wide shoes and then felt they where not needed, but kept the same drum.
IMO
Les Burt[1 wrote on Sun, 14 September 2014 23:15]Aren't the rear drums just 66-77 Toronado rear 11x2 drums with the center &
bolt holes modified to fit the GMCMH rear hubs? Photos sure look similar.
On Sun, Sep 14, 2014 at 12:51 PM, David H. Jarvis wrote:
> Do you know if NAPA #640-1225 brake drums will fit on our GMC?
> Thank you.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Thanks,
Les Burt
Montreal
'75 Eleganza II 26ft
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Adrien & Jenny Genesoto
75 Glenbrook (26-3) Mods LS3.70 FD / Reaction Sys / 80mm Front&Intermidiate / Hydroboost / 16" Tires / Frame Rebuild / Interior Rebuild
Yuba City,Ca. Text 530-nine-3-three-3-nine-nine-6
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| Re: [GMCnet] Brake drums [message #262049 is a reply to message #262010] |
Tue, 16 September 2014 11:32 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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""Les,
To me they look like the 66 Toro front drum (with diff bolt pattern and maybe the bore), the front drums and they where wider then the rear and they used wider shoes also.
I wander if GM started the coach with 3" wide shoes and then felt they where not needed, but kept the same drum.
IMO
""
I think the GMC always used the narrower shoe setup. Some have installed the wider shoes and hardware since the original drum will accommodate them. IIRC the wider shoes come from the B car wagon rears.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Brake drums [message #262068 is a reply to message #262051] |
Tue, 16 September 2014 14:18 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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A Hamilto wrote on Tue, 16 September 2014 10:54Bob de Kruyff wrote on Tue, 16 September 2014 11:32I think the GMC always used the narrower shoe setup. Some have installed the wider shoes and hardware since the original drum will accommodate them. IIRC the wider shoes come from the B car wagon rears. What's a "B car wagon"?
OOPs--sorry. I'm referring to the GM full size station wagons Impala, Caprice, Olds 88, etc before the downsizing in 1977. They had a bigger and wider axles than passenger cars and had specific brakes.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Brake drums [message #262190 is a reply to message #262181] |
Wed, 17 September 2014 23:19 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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G'day,
This appears to be a drum can be made to fit a GMC.
HOWEVER, be careful if you order these, I have seen photos of some on the Internet that are smooth on the exterior surface and don't
have the "ribs" ours have.
The other problem with these drums is that the "only differences" are going to have to be addressed and that is going to cost money
unless of course you have a lathe with a chuck that can grip the 11.00 ID to enable you to machine out the hub center to 4.567
inches and the skill to convert the 5 mounting holes to 8 and locate them correctly.
If you have to have a machine shop do it I would suggest you visit that shop and get a written quote to do the work or you may wind
up paying more for them then you could have purchased them from a GMC vendor for!
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Adrien Genesoto
Harry,
Came across this site that has info on the drums (1966 toro front drums), the center bore size(register) and the 5 bolt are the only
differences to GMC MH rear drums.
http://www.theautopartshop.com/auto+car-usa+parts+year/oldsmobile+toronado+brake-drum+1966.html
FWIW
"When we avoid the mistakes we might have made, we sometimes make the mistakes that we might have avoided."
Adrien
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Brake drums [message #262207 is a reply to message #262181] |
Thu, 18 September 2014 07:43 |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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According to the parts listings referred to here, the 66 toro front drums are the same p/n as the rear drums used on eldos up to 75 and toros up to 78. Even though they are the same p/n, asking for 66 toro drums rather than 78 toro drums might result in differing results depending on where/who you ask.
My uncle has had a late 60's toro rear axle sitting in his junk pile for years and i've eyeballed it many times telling myself that i should compare the drums to those on my coach. Just been too lazy to actually do it as I haven't needed a drum yet. The Toro axle looks like it would make a nice trailer axle.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Sep 17, 2014, at 9:52 PM, Adrien Genesoto wrote:
Harry,
Came across this site that has info on the drums (1966 toro front drums), the center bore size(register) and the 5 bolt are the only differences to
GMC MH
rear drums.
http://www.theautopartshop.com/auto+car-usa+parts+year/oldsmobile+toronado+brake-drum+1966.html
FWIW
--
”When we avoid the mistakes we might have made, we sometimes make the mistakes that we might have avoided.”
Adrien & Jenny
75 Glenbrook
Yuba City,Ca.
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