BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BCOWANWHEELS · 07-13-2007, 04:15 PM

ANYBODY ever try to run the old buick finned aluminum brake drums on our 12 bolt truck rear ends ? i,ve got several of them and if a person was rumming wheels where they could be seen they sure would be cool . i run em on my old hot rods in the past. just a thought.
bob in tn.

ChevLoRay · 07-13-2007, 04:57 PM

My guess is that the backing plates and drum assemblies would have to stay together. They should have the correct 5on5-inch bolt pattern for the 71-72 rear axles. I don't know about bolting the backing plates to the flanges on a 12-bolt axle, though I am sure that someone will know.

A set of polished, finned aluminum Buick drums would look nice peeking through the right set of wheels.

BCOWANWHEELS · 07-13-2007, 06:07 PM

yea like torque thrust D,s all polished . I,am gonna try it when i do my brakes on my 72 just to see if they,ll fit.
bob

jeffspower · 07-14-2007, 01:06 AM

I had a '63 Riv that had them. While they were 5 on 5, the center pilot is bigger than the truck, and later "big" cars. Only a problem with OE wheels that center on the pilot. Not sure what year they changed. Some of the big Buicks had 5 on 4-3/4" in the late 60's IIRC. I would think using the big pilot drum on a small pilot drive axle would create a horrible brake pulse.

ChevLoRay · 07-14-2007, 10:07 AM

I believe the big cars, at least until the late '60's stayed with the big bolt pattern.

I don't think GM used any of the 5 on 4.75 pattern on anything larger than a Chevy or a mid-sized car, i.e, Skylark, LeMans, etc.

I don't recall my '67 Skylark having aluminum drums on it, although they were finned. I don't recall seeing any finned aluminum drums that weren't on a big Buick. My thinking is that '67 would have been the last year, since GM went to disc brakes in '68.

I reserve the right to be wrong, though.

jeffspower · 07-14-2007, 12:12 PM

I was just thinking... I had a '68 Electra that was 5 on 4-3/4" with the aluminum drums up front. I think '67-8-9 & '70 Electra/ Wildcat/ Lesabre were all the smaller pattern 'till '71. They were all built on the same platform anyway.

BCOWANWHEELS · 07-14-2007, 12:39 PM

the late buick drums are small fins i have the early big fins. the ones all the hot rodders use. they dont care for the small fin drums.
bob

07-13-2007, 04:15 PM	#1
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END ANYBODY ever try to run the old buick finned aluminum brake drums on our 12 bolt truck rear ends ? i,ve got several of them and if a person was rumming wheels where they could be seen they sure would be cool . i run em on my old hot rods in the past. just a thought. bob in tn. __________________ I BELIEVE IN JOHN 3:16 Last edited by BCOWANWHEELS; 07-13-2007 at 04:16 PM.

07-13-2007, 04:57 PM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END My guess is that the backing plates and drum assemblies would have to stay together. They should have the correct 5on5-inch bolt pattern for the 71-72 rear axles. I don't know about bolting the backing plates to the flanges on a 12-bolt axle, though I am sure that someone will know. A set of polished, finned aluminum Buick drums would look nice peeking through the right set of wheels. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. Last edited by ChevLoRay; 07-14-2007 at 10:00 AM. Reason: CRS

07-13-2007, 06:07 PM	#3
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END yea like torque thrust D,s all polished . I,am gonna try it when i do my brakes on my 72 just to see if they,ll fit. bob __________________ I BELIEVE IN JOHN 3:16

07-14-2007, 01:06 AM	#4
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END I had a '63 Riv that had them. While they were 5 on 5, the center pilot is bigger than the truck, and later "big" cars. Only a problem with OE wheels that center on the pilot. Not sure what year they changed. Some of the big Buicks had 5 on 4-3/4" in the late 60's IIRC. I would think using the big pilot drum on a small pilot drive axle would create a horrible brake pulse. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

07-14-2007, 10:07 AM	#5
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END I believe the big cars, at least until the late '60's stayed with the big bolt pattern. I don't think GM used any of the 5 on 4.75 pattern on anything larger than a Chevy or a mid-sized car, i.e, Skylark, LeMans, etc. I don't recall my '67 Skylark having aluminum drums on it, although they were finned. I don't recall seeing any finned aluminum drums that weren't on a big Buick. My thinking is that '67 would have been the last year, since GM went to disc brakes in '68. I reserve the right to be wrong, though. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

07-14-2007, 12:12 PM	#6
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END I was just thinking... I had a '68 Electra that was 5 on 4-3/4" with the aluminum drums up front. I think '67-8-9 & '70 Electra/ Wildcat/ Lesabre were all the smaller pattern 'till '71. They were all built on the same platform anyway. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

07-14-2007, 12:39 PM	#7
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: BUICK aluminum rear finned brake drums ON A 1/2 TON TK. REAR END the late buick drums are small fins i have the early big fins. the ones all the hot rodders use. they dont care for the small fin drums. bob __________________ I BELIEVE IN JOHN 3:16



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