B-body front end in a-body

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383-Plymouth

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Hey Guys quick question , my 70 plymouth duster has the larger drum brakes b-body ball joints and stuff , And it has a factory big block a-body k-frame , I need to do lower control arm bushings and strut bars do I order all that stuff for a 70 b-body??
 
LCA bushings are the same, but I doubt the car has B-body drum brakes with large upper ball joints (I suppose somebody could have done that, but it is unlikely).
 
Jim Lusk said:
LCA bushings are the same, but I doubt the car has B-body drum brakes with large upper ball joints (I suppose somebody could have done that, but it is unlikely).
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It does , it has the entire break assembly and ball joints out of A b-body , the ball joint part number is moog K772
 
Ok, so, you have spindles from a B-body. It's just a spindle and brake swap, nothing else will actually fit. You don't have a "B-body front end", just spindles. Not really any different than doing a 73+ disk conversion, just earlier spindles.

You still have A-body control arms, strut rods, etc. The only B-body replacement parts you would use are the wheel bearings and brake stuff. Everything else will be A-body. The UCA's are 73+ A-body stuff with large ball joints. You'll want to figure out what year your strut rods are, because 67-72 and 73+ take different bushings.
 
72bluNblu said:
Ok, so, you have spindles from a B-body. It's just a spindle and brake swap, nothing else will actually fit. You don't have a "B-body front end", just spindles. Not really any different than doing a 73+ disk conversion, just earlier spindles.

You still have A-body control arms, strut rods, etc. The only B-body replacement parts you would use are the wheel bearings and brake stuff. Everything else will be A-body. The UCA's are 73+ A-body stuff with large ball joints. You'll want to figure out what year your strut rods are, because 67-72 and 73+ take different bushings.
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Okay thank you so much for the reply , it confused me pretty bad when I ordered a-body lower and upper ball joints and they were both way to small lol , thanks for the help guys and is there anyway to tell the difference between 72-73 bushings
 
383-Plymouth said:
Okay thank you so much for the reply , it confused me pretty bad when I ordered a-body lower and upper ball joints and they were both way to small lol , thanks for the help guys and is there anyway to tell the difference between 72-73 bushings
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So the later 73 a-body control arms takes the same ball joint as a B-body?
 
383-Plymouth said:
Okay thank you so much for the reply , it confused me pretty bad when I ordered a-body lower and upper ball joints and they were both way to small lol , thanks for the help guys and is there anyway to tell the difference between 72-73 bushings
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Take a look at the strut rods themselves. The 67-72 ones are fine thread, the 73+ ones are course thread.

383-Plymouth said:
So the later 73 a-body control arms takes the same ball joint as a B-body?
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Yes. In '73 Mopar started using a lot of the same parts across all the different platforms (well, except C-bodies and trucks). The ball joints, wheel bearings, rotors, caliper mounts etc were the same for A/B/E bodies and a lot of that stuff will interchange for the earlier cars.

Honestly, you already have the large bolt pattern wheels and the right ball joints, I would just get a set of disk spindles and go with the 73+ disk brakes rather than buying all the stuff to refurbish the B body drums. That's just me though. Obviously the cost will still be higher to go to disks, but if you have to completely refurbish the drums you're probably gonna spend close to half the cost of the disk upgrade, and still have B-body drums.

10.95" Front Disc Brake Kit (Stage 1)

Just a thought. I'm pretty much the king of the "while I'm at it" disease though.
 
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