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#76 | |
Registered User
![]() Join Date: Oct 2013
Location: Elkton
Posts: 693
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Re: Rear Brake Drum Dilemma
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#77 |
Future TOTM Winner
Join Date: Aug 2006
Location: Bulverde, TX
Posts: 2,692
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Re: Rear Brake Drum Dilemma
I also have one of these axles under a customers GMC. Does anybody know the minimum thickness that drums can be machined to? I don't see it on the drum anywhere and can't find the data in any book.
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72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com |
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#78 |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
I think it's 11.06"
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#79 |
Future TOTM Winner
Join Date: Aug 2006
Location: Bulverde, TX
Posts: 2,692
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Re: Rear Brake Drum Dilemma
So the inner drum diameter can be 11.06"? I'm not a brake guy, I just need to tell the guys that are how much we can open them up while turning. Thanks!
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72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com |
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#80 |
Registered User
Join Date: Nov 2014
Location: Lake in the Hills IL
Posts: 17
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Re: Rear Brake Drum Dilemma
I just redid the brakes on my 66 GMC and got both the 2067DGS and the wagoneer drums yes with machine work they would have worked perfectly. But the 2067DGS is a perfect fit. I measured and rechecked the shoes hit the drum completely. Thanks for this thread made it easier. LMC had sent me the wrong 3" Chevy drums told me sorry nothing we can do.
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#81 | |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
Quote:
What is the measurement on your 2067DGS drums? The O'Reilly ones I measured were 2 7/16" and would not fit my '65 GMC leaf-version rear. |
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#82 |
Registered User
Join Date: Nov 2011
Location: Omaha, Nebraska
Posts: 436
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Re: Rear Brake Drum Dilemma
Rockauto has the drums to which you refer in stock... (Centric - 12266037) They are $100.89...
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Travis' Tribute Truck - 65 C10 Frame Up Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=495073 |
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#83 | |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
Quote:
In any case, it was significantly cheaper for me to buy the Wagoneer drums even after the machine shop charge. |
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#84 |
Registered User
Join Date: Nov 2011
Location: Omaha, Nebraska
Posts: 436
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Re: Rear Brake Drum Dilemma
Rats! Sorry...
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Travis' Tribute Truck - 65 C10 Frame Up Restoration http://67-72chevytrucks.com/vboard/s...d.php?t=495073 |
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#85 |
Registered User
Join Date: Nov 2014
Location: Lake in the Hills IL
Posts: 17
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Re: Rear Brake Drum Dilemma
Not sure on the exact measurements but I did it against my my rear end with shoes in place. It's close but they sit all the way on the drum. They are from oriellys
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#86 |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
If those drums with the same number from the same store were the same as the ones I looked at with the 2 7/16" measurement, then your rear axle (and thus the original drums) are not the same as mine.
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#87 | |
Registered User
Join Date: Jul 2013
Location: Phoenix, AZ
Posts: 348
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Re: Rear Brake Drum Dilemma
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#88 |
Registered User
Join Date: Jul 2013
Location: Phoenix, AZ
Posts: 348
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Re: Rear Brake Drum Dilemma
Here's another search in autoatlanta for gmc.
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#89 |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
Thanks. Good information. I'm surprised they became available. Possible somebody found some old stock somewhere though.
But, take a look at post #70 in this thread. The Wagoneer drums only cost me $69 a piece after paying for the machine work. So in the end, I'm glad I couldn't get the Centric ones. They are overpriced. |
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#90 | |
Registered User
Join Date: Jul 2013
Location: Phoenix, AZ
Posts: 348
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Re: Rear Brake Drum Dilemma
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#91 |
Registered User
Join Date: Apr 2014
Location: Rochester, MI
Posts: 206
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Hey Roger. Hope you're still out there and willing to communicate. If so..great!
Hopefully my questions are simple and straight to the point. 1. Is your braking still in perfect working order with the 74 wagoneer drums from Orielly? 2. I have a 66 GMC with rear leafs and a dana 44. The build date was 1965. Yes, the drums are bigger than the front (depth about 3.5 inches). Sounds just like yours. If I have the center bored out to specs and the lug openings, will I need to do anything else? Your additional info on the emergency cable sounded like it has nothing to do with the drum working. That is, it was a mod you needed to make because the plate was incorrect. Buy drums, have them machined, and put em on. Sound to good to be true.lol |
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#92 | |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
Quote:
Yes, the Wagoneer drums work perfectly with the center hole machining and lug holes drilled out larger. Go for it. Right the e-brake cable issue doesn't have an effect on the drum working. But if you use the stock e-brake setup, you either have to have custom rear cables made (I suggest Inline Tube for that) or find as set of donor back plates and do what I did. Donor plates would be simple to come by at a wrecking yard. That style was use extensively over the years. |
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#93 |
Registered User
![]() Join Date: Oct 2013
Location: Elkton
Posts: 693
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Re: Rear Brake Drum Dilemma
I have a whole dana 44 6 lug rear differential for sale for 100.00 its from a 68 gmc.
the drums are in great shape. |
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#94 |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
Makes a great rear for a 55-59.
Perfect width, very wide assortment of ratios available. All parts for it are available too including the trac-loc posi units. Unlike the situation for the original rears for our trucks. I solved the situation for replacement drums. |
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#95 |
Registered User
Join Date: Apr 2014
Location: Rochester, MI
Posts: 206
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Man o man Roger. Im still unclear about backing plate dilemma. I am 100% 65 gmc dana 44, 3:54 gears as original. Why do I need to make a mod at all for e brake. Does it not work with wagoneer drum? Or, is my stock backing plate too large or small??
All I need are the drums. Why I'm getting confused is I'm thinking you have a 57 backing plate. Mine is a 65. One more clarification would be greatly appreciated. BTW, excellent thread. Thank you a million. I'll bet every guy with a 65 or 66 will find this extremely helpful! |
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#96 | |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
Quote:
My backing plates came with the '65 GMC rear assembly so they are the same as yours. The e-brake issue has absolutely nothing to do with the usage of Wagoneer drums. The issue is the rear e-brake cables that are used with this generation of truck use this style of connection to the backing plate: While the '65 GMC pickup e-brake cable mounts to the backing plates like this: So, if you have stock rear e-brake cables in your truck or if you order new ones, they won't mount to the 65 GMC backing plate unless you do one of two things. Get custom rear e-brake cables or modifiy the backing plates using donor plates like I did. Here's a photo of the donor plates I used along with my 65 GMC plates: Here's a photo of my 65 GMC plates after doing the modification and my Chevy truck original e-brake cable and the 65 GMC e-brake cable. I hope this clears it all up for you. |
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#97 |
Registered User
Join Date: Jan 2016
Location: Spokane WA
Posts: 106
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Re: Rear Brake Drum Dilemma
Thanks guys, I just had to do the exact same thing on my 67 GMC. It had the same drums you mentioned. Can't find them anywhere. I did the same Jeep Wagoneer drum modifications and it fits like a glove. I would have gone and bought a whole new rear end if I hadn't seen this thread.
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#98 |
Registered User
Join Date: Feb 2010
Location: San Angelo, Tx
Posts: 1,068
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Re: Rear Brake Drum Dilemma
Glad I posted everything.
Aren't forums a great thing for our hobby! |
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#99 |
Registered User
Join Date: Jan 2016
Location: Spokane WA
Posts: 106
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Re: Rear Brake Drum Dilemma
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#100 |
Registered User
Join Date: Aug 2012
Location: Rathdrum ID
Posts: 1,128
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Re: Rear Brake Drum Dilemma
I took mine to the scrapper when I swapped to 5 lug. Guess I should have kept them.
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