Disk brake steering knuckle

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i do remember the early stuff using small ball joints (63-66 maybe) but wasn’t quite sure on when things changed. I do remember my dart having big ball joints with the fist brakes but completely forgot about them changing over to sbp so he would have a mismatch on the bolt pattern. But that’s not a huge deal, we just need to get it so the tow truck driver and move it and we can get it in my uncles shop. There is 1 75 dart there with disk brakes so that might work. All of the other cars are missing the knuckles so prob just easier to get the front end stuff from the dart there or doing a wanted ad depending on his prices. I have more important things to replace on the charger so disk brakes on my car is further down the list. But that does give us a great cheat sheet for when we’re looking at other front ends.

The '75 stuff would work, if it's got disk brakes it would have the large ball joint spindles and UCA's and actually a more desirable K frame as well if you wanted to go that far. If you grab the K grab the steering stuff as well. If you just grab from the control arms out you can leave the steering stuff.

I think you might had better read your answer?

Through 72, small upper ball joints with FACTORY drum or disk, but not if you convert to 73/ later disc

I think we pretty much decided that "maybe" 73 and later 9" drum factory use small joints, but "maybe" the 10 front drums use large ones. Not sure. There's been discussions about that. And obviously the 73/ later disk, which are single piston, are large ball

No, I read my answer and it's correct. From the factory that's how stuff came, I clearly said the 73+ disk brake spindles use large ball joints and that 73+ UCA's use large ball joints. If someone swapped the car in the junk yard over to something else he'll have to figure that out by inspecting it anyway, since it could be almost anything if it's not stock.

"We" didn't decide anything of the sort regarding the 73+ drum brakes. 73+ 10" front drum brake spindles use large ball joints, and 73+ 9" front drums don't exist past early production of the '73 model year.

The factory TSB is pretty clear, the 10" drums were redesigned and used from ~ November 1 of 1972 for the rest of the '73 model year. The 73+ A-body 10" drums were redesigned B-body brakes, and the differences from the B-body brakes are listed 1- 4" bolt circle hub, 2- backing plate center hole enlarged to clear the '73 spindle (which had large ball joints and bearings, hence the larger center hole needed), and 3- 1 1/8" wheel cylinders to balance the A-body. The TSB clearly states that the 6 cylinder cars will keep their 9" rear drums. Before that date they weren't mixing and matching, if you had 10" front drums you had 10" rear drums, 9" front drums got 9" rear drums. The fact that the TSB says the 6 cylinder cars get 10" front drums and 9" rear drums would indicate the redesigned 10" front drums replaced the 9s and that the 9" front drums were gone after that date. As with everything Ma mopar maybe not EXACTLY that date, but the 9" drums were discontinued around that time.

You can read the TSB's here https://www.hamtramck-historical.com/images/TSBs/1973/05-03-73C page1.jpg
https://www.hamtramck-historical.com/images/TSBs/1973/05-03-73C page2.jpg

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Can't he take the knuckles off an F or M body and keep the disc brakes? Lots of 5th Aves in junkyards

Yes, he can take the knuckles and use those. But those cars don't have a UCA he can use, and the FMJ disk spindles need a large upper ball joint. He said the car he's got "has no front suspension", and you can't use the control arms from the FMJ's.