65 Impala Rear Control Arms 10bolt to 12bolt - Impala Tech
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post #1 of 8 (permalink) Old 03-07-2010, 06:50 PM Thread Starter
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65 Impala Rear Control Arms 10bolt to 12bolt

Hello Guys, If I convert a 65 10 bolt to a 12 bolt posi, can I reuse all 3 rear control arms? I understand I have to add the 2nd upper control arm and frame mount. My car has the two lower arms, one upper arm and the panhard rod. I wouldn't think the left hand, upper arm and mount would be too easy to find either.

I'm really not wanting to tear into this beautiful car again.
I guess the message is, slow down and do it right the first time.
And the phrase: "One thing leads to another" gets expensive, to say nothing about what it does to the knees and back.

I'm sure you can all relate.
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post #2 of 8 (permalink) Old 03-07-2010, 06:59 PM
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Yes, you just have to add the bracket to the rear-end. oh your using a 12 bolt.
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post #3 of 8 (permalink) Old 03-07-2010, 09:48 PM
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You will need the upper arm and frame bracket from a 65 or 66 impala. The 67-70 arms were different. Or buy a adjustable set. All the 12 bolt housings should have the 2nd upper arm bracket.

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post #4 of 8 (permalink) Old 03-07-2010, 11:51 PM Thread Starter
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Larry, Right, the 12 bolt I have does have both upper brackets. Does your statement about needing a 65-66 upper arm also mean that the 12 bolt housing I'm using has to be from a 65-66 also? I'm wondering if the 67+ arms are different because the 12 bolts were different also. I'm not sure the 12 bolt I can get is from a 65-66. Guess I need to check some more axle codes. Something tells me I was told it was from a 69 or 70. I need to check.
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post #5 of 8 (permalink) Old 03-08-2010, 02:09 AM
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Quote:
Originally Posted by palalt View Post
Larry, Right, the 12 bolt I have does have both upper brackets. Does your statement about needing a 65-66 upper arm also mean that the 12 bolt housing I'm using has to be from a 65-66 also? I'm wondering if the 67+ arms are different because the 12 bolts were different also. I'm not sure the 12 bolt I can get is from a 65-66. Guess I need to check some more axle codes. Something tells me I was told it was from a 69 or 70. I need to check.
Length and bushings are different. The overall length is the same, but because of the difference in the bushing size, they changed the lengths of the arms a bit. Advantage of aftermarket control arms are they are stronger than the stamped metal pieces (you can make yours stronger by boxing in the stampings with flat stock and a welder, but you are still stuck with a rubber mounting bushing unless you also change them over to polyurethane). The bottom arms are in tennssion and the upper arms are in compression when you are accelerating (I ripped the lower right mounting bracket loose from the body on my car).

Big Dave
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post #6 of 8 (permalink) Old 03-08-2010, 05:45 AM
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The 65 through 70 ,10 and 12 bolt rear ends will all interchange. but yours being a 65 will need 65-66 upper arms as they were changed in 67 . The lower arms were basicly all the same as was the panhard bar. And as Big Dave said You can beef up the stock ones by boxing them in or buy aftermarket.

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post #7 of 8 (permalink) Old 03-31-2010, 02:19 PM
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Quote:
Originally Posted by Big Dave View Post
The bottom arms are in tennssion and the upper arms are in compression when you are accelerating (I ripped the lower right mounting bracket loose from the body on my car).

Big Dave
Is that right? When accelerating the lower arm is pushing forward and the upper arm is pulling back. Wouldn't that mean the upper arm is in tension and the lower in compression.

1966 Caprice project
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post #8 of 8 (permalink) Old 03-31-2010, 06:39 PM
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Im pretty sure it is the other way. the snout on the rear-end wants to climb up which pulls on uppers. becuase i have seen the opposite that Big Dave mentioned. tearing the uppers out from the cross-brace.

Brad
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