Master cylinder

In the above calcs, keep in mind that the single piston calipers get a 'free' force on the back side pad equal to the force from the single piston. So you either compare the single piston to only 2 of the K-H pistons, or compare 2x the single piston force against all 4 of the K-H pistons's total.

With the latter, you end up with 2950 versus 4150 lbs force....which is the point on the small GM caliper bore being a problem... it'll be under braked up front.

But the OP has the Mopar ones....so no problemo. I just wuz checkin'.