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#1
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Same 9.5" Brake Drums for 10 & 12-Bolt Rear Ends?
Are the same 9.5" Drums used on both the 10-bolt and 12-bolt rear ends?
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Kyle Kruszewski
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#2
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I believe they are. When I changed my Firebird from a stock 10 bolt to a 12 bolt, I don’t remember getting different brakes. I ‘m pretty sure I just swapped them over.
It was 20 yrs ago, tho Murf Sent from my iPhone using Tapatalk Pro |
#3
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Thanks, Murf! I’m pretty sure they’d be the same, but just checking.
Sent from my iPhone using Tapatalk
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Kyle Kruszewski
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#4
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I should add, I swapped backing plates & drums over while changing rear ends.
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#5
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Other than the different divisions used different cooling fin designs, I believe that tons of GM cars used 9.5, 5 X 4.75 bolt circle drums than interchanged. 10 and 12 bolt should make zero difference.
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#6
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Thanks, Sirrotica!
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Kyle Kruszewski
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#7
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No there is 2 different size register holes.
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#8
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I believe that only applies if you are swapping Chevy 12 bolt vs Pontiac 10 bolt.
If you have a 70-72 Pontiac 12 bolt rear axle and swapping 10 bolt for 12 bolt, it should be a exact interchange, IF I remember the one 12 bolt rear I had under by GTO. Course that was the 12 bolt that blew up like the 10 bolt rears too. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#9
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How is it that the wheels interchange between the two, but brake drums won't ?
Looking at brake drum specs the center hole is within 1/100th of an inch, 2.81 vs 2.82. A rat tail file and 2 minutes will make them the same ID. Rust on an axle flange is many times more than .01 thick, a rat tail file will make short work of that slight interference. |
#10
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It's the housing tube flange that can be different, due to the tube diameter, which would impact the backing plate fitment. It would look like crap if you tried to wobb it out with a file.
Drums can be slightly different, the depth/axle stand off, but in most cases will 'work'. EDIT: Have to make sure it's not an 'O' 12 bolt too. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be Last edited by HWYSTR455; 08-09-2019 at 01:37 PM. |
#11
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NO... it's the center hole on the brake drum that is .01 difference.
OPs original question is: Quote:
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#12
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Guess I didn't read carefully, my bad. I was thinking along the lines of swapping the complete brake setup over from rear to rear, and apologize if it came across as an attack.
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#13
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Quote:
That’s my fault, guys. I mentioned them in my reply. Sorry if I drove this thread into the ditch! Sent from my iPhone using Tapatalk Pro |
#14
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Rear axle register
Good question ! Now i have to go measure the register on the 12 bolt axles i made when i owned summers bros and the center of the 11 inch impala rear drum set-up with housing ends i made for a big ford bearing !
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#15
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Just some info, S10 rear brake drums are the same as 8.2. They even have the same part number.
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The Following User Says Thank You to hobbygto65 For This Useful Post: | ||
#16
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I upgraded my rear brakes from the 9.5 drum set up to the 11" drums for my 1976 Firebird. I did the 1LE front set up and used the 11" rear drum set up form a 1977 Lemans. Went up an inch in the front and 1.5" in rear. Works great.
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#17
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I made impala housing ends to adapt 11 inch drum brakes and big ford bearings and made chevy c clip eliminator axles when i owned summers bros for my 63 nova , but sold the nova and im setting up a chevy rear end for my 63 lamans !
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