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early disc lower ball joint question
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Author:  sixsignet [ Fri May 26, 2006 10:35 am ]
Post subject:  early disc lower ball joint question

I am rebuilding the front end on a 63 Valiant and installing 10" drums from a 66 Dart.
If I use K7021 and K7023 (65-72 disc lower ball joints) instead of K785 and K787, do I need to drill-out the mounting holes to a larger diameter, or are they exactly interchangeable?

Author:  Pierre [ Fri May 26, 2006 12:18 pm ]
Post subject: 

The 7021/7023 do have the larger bolt holes then the drum lbj's. When doing the KH disc conversion on my 71, I didn't think I had to get the lbj's (originally had 9" drums) but when coming to assemble I found out otherwise.

Infact I believe thats the only difference, bolt hole sizes. But are you sure 7021/7023 are appropriate for 10" drum conversion? Rockauto and kragen both list seperate ball joints between disc and drum, but don't differentiate betweeen 9" and 10" drums.

Author:  sixsignet [ Fri May 26, 2006 12:40 pm ]
Post subject: 

I just searched again and found a post that explains it.
The last entry by Doctor Dodge wraps it up, but Doug Ahern confirms that the disc lower ball joints can be used as a HD replacement on drum brakes. My 10" drum assemblies have 1/2" holes, like the 9" drums.

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