3/4 ton brake drum confusion! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bobs409 · 02-10-2006, 12:34 PM

I'm very confused. I ordered new rear brake drums from the Autozone.com website for my truck and they just arrived. Problem is, they don't look like the right ones to me. ?

I have a 1971 C20 with what I believe is an Eaton rear. (it has the large salad bowl center and the bolts are on the front side)

On the website, they have 2 possibilities, one with a Dana rear and one without. I clicked the one without and ordered them. (see pics below) The ones shown are 11 5/16" X 2 3/4"

I haven't had my drums off for a few years (truck is off the road) but when I did have them off last, I had to remove the center hub and pull the axle to get the drums off. The ones below look like that wouldn't need to be done.

Questions are;

1) Do I have an Eaton rear as I described above?
2) Are the drums in the pics correct? If not, what are they correct for?

Thanks in advance for any help...

Bob

stueber68 · 02-10-2006, 06:28 PM

They are correct! You have to remove the hub from the drum. If I remember correctly the wheel studs are what hold them in place.

bobs409 · 02-10-2006, 06:45 PM

Thanks alot!

I'm glad to hear I can use them. I'll have to get in there and see how to seperate them.

Bob

drink2mny · 02-10-2006, 11:48 PM

Take out the axle. then use a special hub socket. either has 4 or six prongs that will go into the spindle nut. take spindle nut off the a washer, then another spindle nut. The whole heavey SOB should slide of the spindle now..

The just get a brass drift and a heavy hammer and pound out the lugs. You can reuse them if you don't mess them up.
Then reverse process and all should be A OK....

roger0080 · 02-11-2006, 12:30 AM

Yeah the wheel studs "pound" out very easily -- but be sure to take it in and have a shop with a press and PRESS on the new assembly together.

Last fall I POUNDED my studs into the drum and hub and let me emphasis the pounding part. The last 1/4" of the studs to get down tight are a bugger. Just take it in for the whole disassembly/reassembly. I wouldn't do it myself again without a press.

bobs409 · 02-11-2006, 08:33 AM

Thanks guys, all good advice. I appreciate it.

bobs409 · 03-10-2006, 07:30 AM

Just a follow up...

Everything went real smooth and just as you guys told me. It was also the perfect time to justify buying a new tool for the garage.... A 12 ton shop press.

(those lugs didn't give it any trouble)

red71cheyenne · 03-10-2006, 01:01 PM

mmmm, new tool smell....

Congrats! Jeff.

02-10-2006, 12:34 PM	#1
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	3/4 ton brake drum confusion! I'm very confused. I ordered new rear brake drums from the Autozone.com website for my truck and they just arrived. Problem is, they don't look like the right ones to me. ? I have a 1971 C20 with what I believe is an Eaton rear. (it has the large salad bowl center and the bolts are on the front side) On the website, they have 2 possibilities, one with a Dana rear and one without. I clicked the one without and ordered them. (see pics below) The ones shown are 11 5/16" X 2 3/4" I haven't had my drums off for a few years (truck is off the road) but when I did have them off last, I had to remove the center hub and pull the axle to get the drums off. The ones below look like that wouldn't need to be done. Questions are; 1) Do I have an Eaton rear as I described above? 2) Are the drums in the pics correct? If not, what are they correct for? Thanks in advance for any help... Bob Attached Images __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

02-10-2006, 06:28 PM	#2
stueber68 1968 C20 Vortec Beast Join Date: Jun 2005 Location: STILLWATER,OKLAHOMA Posts: 483	Re: 3/4 ton brake drum confusion! They are correct! You have to remove the hub from the drum. If I remember correctly the wheel studs are what hold them in place. __________________ Ugly or not it still kicks a**!

02-10-2006, 06:45 PM	#3
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	Re: 3/4 ton brake drum confusion! Thanks alot! I'm glad to hear I can use them. I'll have to get in there and see how to seperate them. Bob __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

02-10-2006, 11:48 PM	#4
drink2mny Registered User Join Date: Jun 2003 Location: spokane wa Posts: 2,189	Re: 3/4 ton brake drum confusion! Take out the axle. then use a special hub socket. either has 4 or six prongs that will go into the spindle nut. take spindle nut off the a washer, then another spindle nut. The whole heavey SOB should slide of the spindle now.. The just get a brass drift and a heavy hammer and pound out the lugs. You can reuse them if you don't mess them up. Then reverse process and all should be A OK.... __________________ Support The Board

02-11-2006, 12:30 AM	#5
roger0080 Registered User Join Date: Nov 2000 Location: Carver County, Minnesota, USA Posts: 626	Re: 3/4 ton brake drum confusion! Yeah the wheel studs "pound" out very easily -- but be sure to take it in and have a shop with a press and PRESS on the new assembly together. Last fall I POUNDED my studs into the drum and hub and let me emphasis the pounding part. The last 1/4" of the studs to get down tight are a bugger. Just take it in for the whole disassembly/reassembly. I wouldn't do it myself again without a press. __________________ 72 Chev C-10 90% restored (former AZ truck) ... 71 Chev K-20 Cheyenne my vacation crusier... 72 Chev C-10 Now retired and striped after many faithful miles... 72 GMC 1500 Retired to the junk yard after bought new in '71...

02-11-2006, 08:33 AM	#6
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	Re: 3/4 ton brake drum confusion! Thanks guys, all good advice. I appreciate it. __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

03-10-2006, 07:30 AM	#7
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	Re: 3/4 ton brake drum confusion! Just a follow up... Everything went real smooth and just as you guys told me. It was also the perfect time to justify buying a new tool for the garage.... A 12 ton shop press. (those lugs didn't give it any trouble) __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

03-10-2006, 01:01 PM	#8
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: 3/4 ton brake drum confusion! mmmm, new tool smell.... Congrats! Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

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