Slant Six Forum :: Big 10-inch

The main reason I'm considering changing the 9" front drums is that I read, maybe on-site that the author wouldn't 'go over 40 MPH' with the 9's due to the undersized bolts into the LBJ. I get the impression that 10" drums up to '72 would fit the current ('67) upper control arms, with a new LBJ. And be economical at this time. Just opened the statement enclosed.

The main reason I'm considering changing the 9" front drums is that I read, maybe on-site that the author wouldn't 'go over 40 MPH' with the 9's due to the undersized bolts into the LBJ.

9" brakes in good repair will give you adequate performance; you just have to allow yourself a little extra room.

It's your money, but if it were mine I wouldn't spend it on 10" drums but would save it untl I could do a proper disc brake upgrade.

Author:	slantfin [ Mon Jan 15, 2007 5:01 pm ]
Post subject:	Big 10-inch
I'm wonderining what 10-inch drums will fit on my 67 A-body. Is it ok to just change the fronts and leave the rears 9" drums? This is just for now (safety). If my economy picks up, one day I'll spring for discs and 4.5" bolt circle wheels.

Author:	emsvitil [ Mon Jan 15, 2007 5:10 pm ]
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No problem having 10" front and 9" rear. (other than a possible bolt circle mismatch which makes tire rotation and the spare a pain)

Author:	AnotherSix [ Mon Jan 15, 2007 6:09 pm ]
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Our 65 had 10" drums and it was small bolt pattern. If you can find a v-8 car (not so easy) you could get the whole setup, front and rear. Our 65 had the normal small 4 bolt bearing retainers on the rear, so those old 10" backing plates should fit a rear that came with the 9" drums.

Author:	75duster [ Wed Jan 17, 2007 10:08 pm ]
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my 75 duster has 10 in fronts and 9 in rears w/ a small bolt pattern, if it helps

Author:	slantfin [ Wed Jan 24, 2007 8:59 pm ]
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The main reason I'm considering changing the 9" front drums is that I read, maybe on-site that the author wouldn't 'go over 40 MPH' with the 9's due to the undersized bolts into the LBJ. I get the impression that 10" drums up to '72 would fit the current ('67) upper control arms, with a new LBJ. And be economical at this time. Just opened the statement enclosed.

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Big 10-inch https://slantsix.org/forum/viewtopic.php?t=21447	Page 1 of 1

Author:	dakight [ Thu Jan 25, 2007 3:42 am ]
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Quote: The main reason I'm considering changing the 9" front drums is that I read, maybe on-site that the author wouldn't 'go over 40 MPH' with the 9's due to the undersized bolts into the LBJ. I get the impression that 10" drums up to '72 would fit the current ('67) upper control arms, with a new LBJ. And be economical at this time. Just opened the statement enclosed. Some people are given to exageration. 9" brakes in good repair will give you adequate performance; you just have to allow yourself a little extra room. It's your money, but if it were mine I wouldn't spend it on 10" drums but would save it untl I could do a proper disc brake upgrade.

Author:	SlantSixDan [ Thu Jan 25, 2007 7:59 am ]
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Quote: The main reason I'm considering changing the 9" front drums is that I read, maybe on-site that the author wouldn't 'go over 40 MPH' with the 9's due to the undersized bolts into the LBJ. Caramba. This nonsense about undersized LBJ bolts was written by Richard Ehrenberg, who often puts together very helpful and informative articles but also sometimes lets his imagination run far, far, far away with him. This is one of those times. There is no such danger.

Author:	Charrlie_S [ Thu Jan 25, 2007 8:23 am ]
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Agreed. I have been running 9 inch brakes on my drag cars for years, at over 100 mph. The main problem with the older 9 inch is the single pot master, which is a safety issue, and easily corrected, and brake fade, under repeated hard stops. Tis last thing is not normally an issue in a drag car. I would not be concerned with any components.

Author:	slantvaliant [ Thu Jan 25, 2007 8:33 am ]
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Quote: 9" brakes in good repair will give you adequate performance; you just have to allow yourself a little extra room. The problem isn't that you might not allow yourself enough space, but that the other folks on the road might not. Better tires, brakes, and handling are good things. Careful driving is critical. Quote: It's your money, but if it were mine I wouldn't spend it on 10" drums but would save it untl I could do a proper disc brake upgrade. Good advice. I drove safely with the 9-inchers for a long while, then went straight to 10.87" disks. It's a good swap. It also made it easier to get a better tire/wheel combination. Good tires are a very good investment. About the "undersize" LBJ bolts on the 9" drum setups - I'd be more worried about the ancient 7/16" lugs holding your wheels on. The left-hand thread lugs especially have often been abused by unknowing tire-store workers, and others working on the car over the years. They may not be as strong as they once were. Whenever you have the wheels off, take a good look at them, just to make sure.

Author:	sethmcneil [ Thu Jan 25, 2007 10:48 am ]
Post subject:	Memories...
Yeah! Those Left Hand threads! HaHa... When I Was Eleven, My Father Had A Good Laugh At My Expense After Asking Me To Remove One Of A Wheel From His Swinger... I Was Really Goin' At It With 150psi And An Impact Gun

Author:	slantfin [ Sun Feb 11, 2007 2:50 pm ]
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Thanks for the input. Sounds like if I follow the advice of Dakight and save pennies for the full upgrade, it'll be ok. I usually leave plenty of braking room anyhow, much to the dismay of the sardine types.

Author:	slantfin [ Sun Feb 11, 2007 3:38 pm ]
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Thanks for the input. Sounds like if I follow the advice of Dakight and save pennies for the full upgrade, it'll be ok. I usually leave plenty of braking room anyhow, much to the dismay of the sardine types.

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