1973-74 B-body vs 1973-76 A-body spindle

JGC403 said

Is there a difference between the Disc brake spindles and the upper control arm on the 73-74 B-body vs the 73-76 A-body disc spindles? I'm looking at the Disc brake conversion kit for an A-body from Master Power Brakes and there kit comes with B-body spindles and upper control arms. I already have a set of 73-76 A-body disc brake spindles and I'm getting tubular upper control arms from Firm Feel. If they are the same I'll see if they I can order a kit and they could leave those parts out and hopefully save a couple bucks.

1968 Plymouth Barracuda Rallye Series Front

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Those kit do not come with “73-74 B-body” upper control arms. An A-body upper control arm is unique in length, configuration, and A-arm leg separation distance.

An A-body upper control arm will be a large ball joint (73-76 Disc & 10” drum A-body) OR small ball joint (63-72 disc & 10” drum)

A larger taper ball joint is needed for 73-76 A-body disk spindle and the taller 73-up B/F/M/J spindle

The only things unique in the MP kit is the caliper adapter and that caliper made by whomever with MP engraved on it.

I’d buy Doctor Diff stuff that’s engineered for Mopars by Mopar people.