10 bolt to 12 bolt - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

 
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post #1 of 11 (permalink) Old Sep 27th, 14, 7:35 PM Thread Starter
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Joe
 
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10 bolt to 12 bolt

does anyone know if the drum backing plates and drums themselves are the same on a 10 bolt and 12 bolt.I recently bought a 12 bolt out of a 1968 chevelle to put in my 1969 chevelle.The 12 bolt didn't come with the brake backing plates and hardware so was just wondering if I can switch mine from my 10 bolt to the 12 bolt..thanks
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post #2 of 11 (permalink) Old Sep 27th, 14, 8:29 PM
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Steve
 
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Re: 10 bolt to 12 bolt

I recently a 10 bolt to 12 bolt swap on my Chevelle and used my 10 bolt brakes on the new 12 bolt. Good luck with the swap, the brakes are the most work in my opinion. Don't forget that the 12 bolt takes a special upper control arm on the passenger side.

Steve

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post #3 of 11 (permalink) Old Sep 27th, 14, 8:52 PM Thread Starter
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Joe
 
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Re: 10 bolt to 12 bolt

thanks for the reply,I was unaware of the special control arm..What am I looking for in the control arms.So I can buy one before the swap
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post #4 of 11 (permalink) Old Sep 27th, 14, 9:34 PM
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Re: 10 bolt to 12 bolt

When I swapped out my 10 bolt for a 12 in my 71 the uppers wouldn't fit. Not a big deal just grind some metal of the arm for clearance and you're good to go. You'll see what I'm talking about.

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post #5 of 11 (permalink) Old Sep 28th, 14, 2:46 PM
oem
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Re: 10 bolt to 12 bolt

I swapped my 69 10 bolt for a 12 bolt and never ran into any problems, everything bolted in just fine.
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post #6 of 11 (permalink) Old Sep 28th, 14, 3:20 PM
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Re: 10 bolt to 12 bolt

Quote:
Originally Posted by zombie1969 View Post
When I swapped out my 10 bolt for a 12 in my 71 the uppers wouldn't fit. Not a big deal just grind some metal of the arm for clearance and you're good to go. You'll see what I'm talking about.
If you're gonna grind down your trailing arm, be sure and weld a 1/2" flat washer to the outside. I wouldnt' trust the arm after taking away that extra metal. The chevy engineers didn't either, as they spotted on a reinforcement.
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post #7 of 11 (permalink) Old Sep 28th, 14, 4:33 PM
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Re: 10 bolt to 12 bolt

I`ve done a few 10 bolt to 12 bolt swaps and never had a issue reusing the control arms.
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post #8 of 11 (permalink) Old Sep 28th, 14, 5:45 PM
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Dan
 
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Re: 10 bolt to 12 bolt

Where is there a problem with the control arms?
I just replaced my 10 with a 12 bolt in a '69 and didn't notice any issues.
Is it on certain years?
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post #9 of 11 (permalink) Old Sep 30th, 14, 11:06 PM
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Re: 10 bolt to 12 bolt

That`s new to me too ??? expand please....

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post #10 of 11 (permalink) Old Sep 30th, 14, 11:26 PM
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Re: 10 bolt to 12 bolt

The 12 bolt center section is larger due to the larger ring gear. The unmodified upper trailing arm on the driver side will hit the center of the housing. Factory upper trailing arms on the driver side had some material ground away and a reinforcement tab welded on.
The brakes are identical between the 10 & 12 bolt rears.

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post #11 of 11 (permalink) Old Oct 1st, 14, 2:06 PM
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Re: 10 bolt to 12 bolt

Quote:
Originally Posted by BlueSS454 View Post
The 12 bolt center section is larger due to the larger ring gear. The unmodified upper trailing arm on the driver side will hit the center of the housing. Factory upper trailing arms on the driver side had some material ground away and a reinforcement tab welded on.
The brakes are identical between the 10 & 12 bolt rears.


Quote:
Originally Posted by 71 454
That`s new to me too ??? expand please...
You MAY be able to get the arms to bolt up, but it will probably be tough getting the bushing and arm holes to line up ( might need to tap or "screw" the bolt through the hole, etc)...

Here's a website with pictures explaining the upper control arm differences...

http://www.leverfamilysite.com/Rear_...ifferences.htm

Although the pictures show 68-72 arms, the same clearance issue exists with all Chevelle 12-bolts and 10-bolt arms...

The brakes should swap completely, even the brake lines should work... Just need to pop the axles out and 4 bolts to remove each backing plate. I have even removed the brakes/backing from the axle while still in the car, without disconnecting the brake lines/hoses (no one around to help bleed the brakes)... Swapped rearends and bolted the brakes back up...

Once you go RAT, you never go back...
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