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Old 09-26-05, 12:03AM   #1
Gach
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Default Aluminum drums

Saw this on another site thought it was interesting, question was
what aluminum drums that come off other car will fit my 67 GTO
It has a chevy 12 bolt rear, but still has 4 3/4 bolt circle with Nat. 5 lugs.

Information added

Yes they will work on a A body. They are metric. You might get
some that are a too tight of fit and won't go over the hub. It
does not take much to make the hole larger. Some fit right on
and some need to honed out a little. Look them over good, some
get cracks in them. That is the list of cars but it's hit an mis
when you find them.

The ID. of the aluminum drum is 9.5 inches, the same as 64-72 A
body cars and 67-69 F body cars. The max diameter the aluminum
drums can be cut is 243.5 mm.



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Old 09-26-05, 05:16PM   #2
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none of those will work....those are the small rears..7.5" 10 bolts, maybe a 8.5" mixed in there..but too small for the drums on a 12 bolt...or get rear calipers off a 79-81 firebird and 80-85 caddy and put rear disks on. Complete kits are 400. coudl make your own for 1/2 the price
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Old 09-26-05, 06:40PM   #3
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Gach, anybody know 100% if this is true, these aluminum drums will not work on my 12 bolt??
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Old 09-26-05, 06:59PM   #4
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Mr. Pontiac... I'm not sure, I took that off another site, hoping
it would be a good chart to go by, but 455_79regal says they
won't worng on the GTO 10 bolts, I myself would like to clear
this up, if it's ture then I'll just take that chart down. I'm not
doubting him.
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Old 09-26-05, 09:43PM   #5
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Good information Fireball, thanks. I'll leave that info up and just add
your post to it.
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Old 09-26-05, 09:53PM   #6
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sorry.....My 77 GP rearend in my 79 regal had 11" drums...I was assuming a 12bolt would have the larger drums. Kinda hard to believe the width of the shoes are the same also, but you have one, so if you have 9.5" drums they shoudl work...dont assume you have the smaller drums.....if you assume..it makes an ASS out of ..well just me I guess.....sorry!
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Old 09-26-05, 09:56PM   #7
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so..all the older 12 bolt car rears have 9.5" drums?
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Old 09-26-05, 10:07PM   #8
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good info...
the only reason I kept the 11" drum rear was cause it had no c-clips
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Old 09-26-05, 10:44PM   #9
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Here you go guys i hope this will help, this was from an early a-body
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Old 09-26-05, 11:04PM   #10
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so..final verdict is as long as you dont have a large car 12 bolt or full option car with a 11" 10 bolt you should be good.......
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Old 09-26-05, 11:21PM   #11
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more options..heavier car...larger rear drums..I had 2 '77 Gp's, one full power and one nothing..one had the 8.5 floater with 11" drums, the other had a twig housing c clip rear with small drums.
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Old 09-27-05, 04:23AM   #12
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Default Floaters

Some of the Olds and Buick stuff in the 70's was .I once orderd bearings for a 70 Pontiac Firebird with a 10 bolt C clip rear.
I picked up the parts and when I got home it was the kit for the "semi floating" rear axles that used the bearing retainers.
Had to take it all back. The book showed two part #'s available. The shop manual I was using even had a section describing the service for this type of diff.
Whether or not it made it as far as 1977 ? I dunno.

DRUMS
The reasons for the aluminum drums was 3 part:
Mostly Weight savings when GM was grabbing at straws to hit CAFE standards.
Cheap source of recycled aluminum for manufacture.
Slightly improved fade resistance due to improved heat dissipation.
These were on light duty cars.
I do not know if they are still available in aluminum as an aftermarket or dealer replacement.
A check at the parts store will tell ya that.
I'm guessing NO.

Mic. those aluminum Drums real good before you leave the yard to se if they will even clean up. Check them for bell mouth / taper and run out.
They may have been prone to warping.
Make sure the balancing buttons / weights have not been knocked off or damaged.
Missing or broken fins can cause out of balance.
Consult Hollander Interchange Manual to be sure they will swap to your particular application. .A yard worth their salt should have the Hollander database at their finger tips and the people that know how to read it.
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Old 09-27-05, 10:18AM   #13
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yes. the yellow car in my signature had the 1977 rearend
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Old 12-17-05, 05:26AM   #14
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hmm
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Old 12-17-05, 11:18PM   #15
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I have a set of aluminum drums on the back of my '66 GTO
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