I stripped the body off the 4 door frame and noticed that there are 2 support bars on the top of the diff that go to the frame and.....the other parts car I have only has one. So my question is...Whats the difference? and why?  And buy the way this is the nicest frame I have ever seen and I will be using it for my 2 door restoration!!

Mine had 2   1966 

 We had a discussion on this a ways back... The single upper arm diff is no doubt a 10 bolt? Just an option they use to do... The holes will be in the frame for the other arm.


 I have a couple of '67 Grandes here with the same thing........ Just an option and lighter suspension thing I believe...

-- Edited by 67Poncho on Sunday 17th of October 2010 07:38:42 PM

Yes, I learned that here too. Heavy duty and light duty suspension. Am I correct in remembering that it's possible to have 2 upper arms with a 10 bolt if it has HD suspension?

My 4dr '7 Grande had 4 arms on the 10 bolt... then it went scarey and I installed a 12 bolt...

Thanks guy's!! I'm thinking thats why the 4 door seemed to handle better than my 2 door?

my car was 6 cyl  'glide   12 bolt  2 arms

427carl wrote:

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my car was 6 cyl  'glide   12 bolt  2 arms

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Ya...Carl.... but the Factory guy's heard about you!! and knew you were going to stuff a big block in it sooner or later so they were prepairing the poor car in advance.

it didnt matter on the power plant the two bars 10 or 12 were only for the heavy duty 65 and up