Rear Brake Drum Dilemma
 

I have a '57 Chevy pickup and the rear housing it has came out of a '65 GMC pickup (with leaf springs).

I cannot find new brake drums for this. I've got the originals but they are worn out.

I just paid $900 to have this rear all rebuilt (with new gears, bearings and posi unit) so I need to somehow solve this issue.

Evidently, these drums are a fairly rare bird and only came on '65-'67 GMC rears with leaf springs and '66-'67 Chevy P10 step vans with leaf springs.

The only present part# that comes up for those is a Centric 122.66037 but the Centric warehouse has been out of stock on those for quite some time with no expected date. I've been searching for about 6 weeks now and only found one supplier with 1 in stock (for $194) but just 1 doesn't do me any good.

Btw, here's the specs on the Centric 122.66037:

http://ecx.images-amazon.com/images/I/41fd72qGnvL.jpg


This may be an option though. There is a brake drum available for a '74 Jeep Wagoneer that is similar. It's a Centric 122.63028

The height is very close and the bolt circle is the same but the hub circle and bolt holes are both too small. I would have to take them to a machine shop to have the hub hole opened up to 3.56" and the bolt holes enlarged to .58". It appears that they would probably work if I had that done. Probably cheaper even after the machine work since these drums cost $28.79 on Rock Auto. It appears if the 122.66037 ever do come back in stock, they will be over $100 a piece.

Here's the 122.66028:

http://www.rockauto.com/getimage/get....63028_DRA.jpg

Any advice or ideas would be appreciated.

Re: Rear Brake Drum Dilemma
 

I don't see anything wrong with your idea but until you can get one modified and test fit it, it's really hard to say. It would be a gamble. Maybe you can buy one and have it modified and if it works, get a second one. If not, you're only out half the cost.

Good luck.

Re: Rear Brake Drum Dilemma
 

Roger55, here is some part link info and alternative drum info from the archives in 6066 GMC site. Hope this helps.

http://www.autopartsnetwork.com/1226...q7KrRfpTt5kdHI
Amazon.com: Centric Parts 122.66037 Brake Drum:...

Matt: The front drums are easy. They are the same as a Chivy and should be easily found and are relatively cheap. They have a 3" height or depth. Here's Rockauto.com's listing.
RAYBESTOS Part # 2005R $33.79
The rear drums are a bit harder, but I have three part numbers you can try for rear 6 lug brake drums. These have a 3.5" height or depth. The first is CENTRIc Part # 12266037 . The second is Allsafe 2067 DGS or Raybestos 2067R.
Rockauto.com shows the Raybestos 2067R for $58.79. Rockauto.com also has the Centric Part #12266037's for $119.79.
I used the Allsafe 2067 DGS from Autozone. The 2067's are for a later model (i think 67-72) truck with 4 wheel drive. It has fins on the outside unlike the original that is smooth. The only modification that I had to make was to drill the 6 lug holes from 1/2" to 9/16" so that the drum would fit on the shoulders on the rear lugs like the original. This drum had the right offset unlike the Chivy drums.
On the Centric, I haven't used that one, but was told it was a direct match to the original (a bit pricier though).
I hope this helps with those looking for rear 6 lug drums.
Regards, Steve New Orleans

Re: Rear Brake Drum Dilemma
 

Another link with a bit more info but extended discussion and problem fixed.

http://www.stovebolt.com/ubbthreads/...=463518&page=1

Re: Rear Brake Drum Dilemma
 

Thanks Steve. Appreciate the info however I've pretty much been through all those numbers.

Your first link is for a 12" drum and I need an 11". Your second link shows the supplier that only has 1 Centric in stock and can't get a second one. Rock Auto does not have Centric 12266037's in stock. If you put it in a cart, it will state that. Except for Auto Parts Network's one drum, no one has any in stock. The Centric warehouse is out and they will not give any dates for having any.

I've been told the Raybestos 2067 will not fit. It has a large cooling fin that is taken in account in the width measurement and the fin overhangs the friction surface since it's not machined out to the end. So the friction surface is too short and will not cover the entire brake shoe.

So, is the Allsafe 2067 DGS you have different than the Raybestos 2067? Are you sure the brake shoe is completely covered by the friction surface?

Re: Rear Brake Drum Dilemma
 

Roger, I was just putting up a thread I recalled, that I thought might help you (sorry about that bad link, I just used the number you posted and it came up with a cheaper price).

I don't not know if the parts are one in the same.
The person you want to PM is Slorio in this thread(Steve). He can answer your specific questions as he's the one that did it.
Good luck, Henry

http://67-72chevytrucks.com/vboard/s...d.php?t=412665

Re: Rear Brake Drum Dilemma
 

I would try the newer one, you can drill the stud holes yourself and just have the hub hole machined to fit. It's cheaper and probably repeatable should you have problems.

Re: Rear Brake Drum Dilemma
 

there is 3 on e-bay right now. the cheapest is $120

Re: Rear Brake Drum Dilemma
 

I've called them all.
Two of those don't have them.

The third has only one and can't get another.

Re: Rear Brake Drum Dilemma
 

sounds like my luck. I would go with the jeep ones.

Re: Rear Brake Drum Dilemma
 

you might look at changing the backing plates and going with another size brake looks like some were 12"

Re: Rear Brake Drum Dilemma
 

any numbers on your old drums? besides the max od? pic maybe?

Re: Rear Brake Drum Dilemma
 

also you might look at the coil backing plates and see if they fit on your axle housing and the drums fit your axle shafts

Re: Rear Brake Drum Dilemma
 

Thanks for your suggestions. The problem is that local junk yards have no old stuff. I'd have to travel. Then there are other issues with that too. If I found an old GMC truck axle, I might have to buy the whole thing as they might not want to take the backing plates off.
So, I'd rather exhaust all efforts to make some new ones work.

Re: Rear Brake Drum Dilemma
 

I've got high hopes for the Jeep ones. Really that may not be bad luck. My machinist only charged me $50 to shorten a driveshaft last week.
I'm guessing that to cut the hub holes out and drill the lug holes larger would only cost maybe $30 a piece. That would still make these Jeep drums significantly cheaper than the Centric 122.66037.

I'm going to take my old ones back off the truck and do some more precise measurements and try to look at more diagrams and specs before ordering anything. I'll take some photos too.

Re: Rear Brake Drum Dilemma
 

roger55,
Hey, it's NOPSI from over at the HAMB. Been a member here too for 10 yrs or so.

Have you tried these guys? CTC's Auto Ranch Inc. Seem to be a wrecking yard in Denton TX selling used and nos parts.

http://www.ctcautoranch.com/NOS%20Pa...%20Rotors.html

Never had any dealings with them, just pulled 'em off the internet.

Re: Rear Brake Drum Dilemma
 

Thanks Joe!

Sounds like it's a possibility they would have NOS drums. I'll call them on Monday.

I don't think I want to go with used ones at this point. I'd like to exhaust my efforts on new ones first even if I have to have them machined.
I'm going to keep this truck a very long time.

Roger

Re: Rear Brake Drum Dilemma
 

I hear that!

Re: Rear Brake Drum Dilemma
 

for future reference what rear axle do you have? Dana-44 or Ho? did all GMC's have the dana?

Re: Rear Brake Drum Dilemma
 

It's out of a '65 GMC pickup with leaf springs and is a Dana 44-1. Don't know about all GMCs.

I bought new 3.54 gears, all the bearings/seals and a Trac-loc positraction unit for it. Including the labor to set it up, that cost me $900.

As purchased in my '57 Chevy 3200 before the rebuild:

http://www.hotrodders.com/gallery/da.../rear_axle.jpg

http://www.hotrodders.com/gallery/da...rear_brake.jpg

Re: Rear Brake Drum Dilemma
 

1 have 66 gmc with leafs and dana 44. was gonna use duralast 8106 from autozone. site lists like 360 gmcs and chevys they fit. fitment says w springs. think that was an option for gmcs,but axle is the same. they look just like my drums, even the rivet holes. don't know if this helps you or not

Re: Rear Brake Drum Dilemma
 

By the books, you should have the same axle as me.

However, the Duralast 8106 will not fit my axle. They are 3" in width and are not wide enough.
Pretty sure those drums are the same as the Raybestos 2005R and they fit the coil spring version of our trucks.

Edit:
Btw in my picture of the axle end, look how the shoulders of the lug studs stick out of the flange. That makes the brake drum need larger holes than the Raybestos 2005R (and I'm sure that duralast 8106) has. If yours is this way, then yours should all be the same as mine and you will have the dilemma finding drums as well.

Re: Rear Brake Drum Dilemma
 

could you put in different lugs and use the drums Flynn was talking about?

Re: Rear Brake Drum Dilemma
 

Roger55:
The original post that MusicMan copied was mine. Has been a while since I had to deal with this, but the 2067 drums are what I used on my Dana 44 after drilling the lug holes from half inch to 9/16. I show EBAY has three vendors with them listed in stock from $57.78 to $73.24 made by Raybestos. Check them here:

http://www.ebay.com/itm/like/170827610314?lpid=82

Hope this helps.
regards,
Steve

Re: Rear Brake Drum Dilemma
 

Thanks Steve,

There is a thread on the jalopyjournal where a guy with this Dana 44 tried this drum and it didn't work. He said the friction surface didn't go out far enough and wouldn't cover the entire shoe.
Here's that link (posts #8 and #10):

http://www.jalopyjournal.com/forum/s...d.php?t=732229

It seems that the Allsafe 2067 DGS that you used was somehow different than the Raybestos 2067 he measured. Autozone doesn't carry these at their stores anymore. They have to be ordered online. They are still 2067DGS but not Allsafe. They are BrakeBest.

I just looked online and none of my local places has one in stock to look at. I could probably get O'Reilly's to order one in and be able to look at it for no charge though.
The O'Reilly's part # is 2067DGS.

I also looked it up on the Napa site and their specs say 3" wide. Not in stock and significantly higher in price too.