Slant Six Forum :: Drum size increase

Hi guys,
I'm in the process of increasing my drum size from 9" to 10" on my 1963 Dart, one of my questions is on the front do I have to knock out the stud plate and bearing housing then insert into new drum ? Can I purchase this part new ? Also do I need to make any other changes to front end suspension or steering. I will be running 14" rims with 195/75/14. I've looked on Rock Auto they have the drums and just about anything else I might need but didn't find the stud plate/bearing housing.
Thanks for any help,
Brian

Brian, to put 10" drums on the rear you will need to find small bolt 10" drum assemblies for your rear. If you have the 7-1/4" rear that might be tough.

I put a dual chamber master on my '66. It was not too complicated. I used the master and pushrod from a '71 drum brake Demon, a distribution block from a '70 Dart, and made my own brake lines. Everything is pretty much a bolt together, and you are much safer with the dual chamber cylinder. Lose a line on a single pot system and you'll know what I mean.

I found the drums, new from the auto supply and I confirmed they are small bolt pattern. It's all something to think about, like I said I've never had a problem with the 9 inch. Thanks for the replies guys.

Author:	bubs63Dart [ Thu May 01, 2008 6:33 am ]
Post subject:	Drum size increase
Hi guys, I'm in the process of increasing my drum size from 9" to 10" on my 1963 Dart, one of my questions is on the front do I have to knock out the stud plate and bearing housing then insert into new drum ? Can I purchase this part new ? Also do I need to make any other changes to front end suspension or steering. I will be running 14" rims with 195/75/14. I've looked on Rock Auto they have the drums and just about anything else I might need but didn't find the stud plate/bearing housing. Thanks for any help, Brian

Author:	SlantSixDan [ Thu May 01, 2008 6:56 am ]
Post subject:
What you are calling the "stud/plate bearing" is in fact the "hub", and you will need to obtain those used. They are not the same between 9" and 10" drum brakes.

Author:	bubs63Dart [ Thu May 01, 2008 1:12 pm ]
Post subject:
Thanks Dan, The hub Brian

Author:	slantzilla [ Thu May 01, 2008 5:08 pm ]
Post subject:
To change from 9" to 10" brakes you need the complete brake assemblies, hubs, drums, spindles, and the lower ball joints.

Author:	dclxvi [ Sat May 03, 2008 9:04 pm ]
Post subject:
i have a complete set that i just took off of my wifes 74 valiant to do a disc brake swap. im in san diego. you can have them for cheap. you can either come down to san diego or i go up there a couple times a month early in the morning for work and i could bring them to you.

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Author:	bubs63Dart [ Wed May 07, 2008 7:31 am ]
Post subject:	Re: Drum size increase
Quote: Hi guys, I'm in the process of increasing my drum size from 9" to 10" on my 1963 Dart, one of my questions is on the front do I have to knock out the stud plate and bearing housing then insert into new drum ? Can I purchase this part new ? Also do I need to make any other changes to front end suspension or steering. I will be running 14" rims with 195/75/14. I've looked on Rock Auto they have the drums and just about anything else I might need but didn't find the stud plate/bearing housing. Thanks for any help, Brian I've decided to stay with my 9" drums in the front even though I've increased rim size to 14" and tire size to 195/75/14. The curb weight of the car is 2700 lbs. I've never had a problem stopping, I'm not an aggressive driver. I used to have a 68 Coronet with 10" drums all around, never had a problem with stopping as well. Although am I right to say I can up my rear brake drum to 10" without any modifications? I'm going to get new drums in the near future and I'm trying to figure out with the help of others if the increase is really much different than sticking with stock 9". Also can I put on a dual camber master brake cylinder to replace my single camber ? Other than being able to find the rubber seal for the lid is there an advantage to doing this and would my rod be used or would I need to replace brake rod too. Thanks for reading and any guidance. Brian

Author:	slantzilla [ Wed May 07, 2008 9:49 am ]
Post subject:
Brian, to put 10" drums on the rear you will need to find small bolt 10" drum assemblies for your rear. If you have the 7-1/4" rear that might be tough. I put a dual chamber master on my '66. It was not too complicated. I used the master and pushrod from a '71 drum brake Demon, a distribution block from a '70 Dart, and made my own brake lines. Everything is pretty much a bolt together, and you are much safer with the dual chamber cylinder. Lose a line on a single pot system and you'll know what I mean.

Author:	emsvitil [ Wed May 07, 2008 1:44 pm ]
Post subject:
Putting a 10" in the rear only will tend to shift the braking to the rear....... You'll have more of a likelyhood of the rear brakes locking up first.

Author:	bubs63Dart [ Thu May 08, 2008 6:39 am ]
Post subject:
Quote: Brian, to put 10" drums on the rear you will need to find small bolt 10" drum assemblies for your rear. If you have the 7-1/4" rear that might be tough. I put a dual chamber master on my '66. It was not too complicated. I used the master and pushrod from a '71 drum brake Demon, a distribution block from a '70 Dart, and made my own brake lines. Everything is pretty much a bolt together, and you are much safer with the dual chamber cylinder. Lose a line on a single pot system and you'll know what I mean. I found the drums, new from the auto supply and I confirmed they are small bolt pattern. It's all something to think about, like I said I've never had a problem with the 9 inch. Thanks for the replies guys.

Author:	slantzilla [ Thu May 08, 2008 8:08 am ]
Post subject:
Quote: I found the drums, new from the auto supply and I confirmed they are small bolt pattern. It's all something to think about, like I said I've never had a problem with the 9 inch. Thanks for the replies guys. The drums will do no good without the 10" brake assemblies. You can't just stick 10" shoes on 9" backing plates.

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