Big vs small balljoint uca

Moparvinson said
Does anyone have a measurement to make sure balljoints are big ones? I am needing a set of big joint upper control arms for a disc swap on my 67 dart. The pull apart yard has a 1974 dart sport but it is front drum and sbp wheels? I have read that all after 1973 were big ball joint. Thanks for any help.

73-76 A body cars, either drum brake, or disc brake, all have large ball joint upper control arms.
Makes no difference.
Go any get those UCA's.

Moparvinson
And why to you disagree with the reply that i posted?
73-76 Slant 6, A body, DRUM brake cars were 10 inch diameter brakes, and used big ball joint upper control arms.
It makes no difference in UCA's if the A body car, is disc or drum brake.
All big ball joint, from the factory, but then who is to say something got swapped out in the life of a 45 year old car.
It is known that a very few early production 1973 A body Slant 6, 9" inch Drum brake cars had small ball joints but that was using up leftover parts on the assembly line until the supply was used up.

Anyway, one way to tell small, or big, is the thread diameter of the ball joint stud.
7/16 small ball joint, 9/16 big ball joint.
Put an open end wrench over the thread area.
Easy peasy.
And for your information.
The 6 cylinder 73-76 A body, Drum brake cars, retained the small bolt pattern until the end, in 1976.