Matt, just to clarify a few things, the terminology for the G-body master cylinder is that it is a stepped bore unit, meaning that it has a larger primary bore designed to push a lot of volume and a smaller secondary bore designed to generate higher pressures, so it essentially behaves as two master cylinders in one. These master cylinder are also sometimes referred to as quick take-up units and were used on applications in conjuction with low-drag calipers which retracted the pistons further than a conventional piston seal, essentially the same thing as knockback, just induced by the square-cut piston seal versus the rotor. There are not any aftermarket options that I know of with a stepped bore at this time, although we've been contemplating it for a while since it would give the benefits of a manual brake system but with a much higher pedal and less overall travel.
A dual master cylinder setup uses two individual master cylinders connected with a balance beam, allowing for different bores front and rear. This type of master cylinder is the only way that I know of to effectively run a mismatched caliper piston area front and rear and still get away with it, but could be a solution for running the larger C5/C6 front calipers in the rear if one was so inclined.
As for axle bearings, we've had much better luck with the SET20 tapered roller bearing setups than the RW207 ball-bearings for postively retained axle setups like the Ford 9" and other aftermarket options using those 80mm bearing options. The SET20's are preloaded through the external seal with the axle reatainers whereas there is no such axial preload with the ball-bearings, so the amount of endplay is determined by the bearing tolerances and condition which will only get looser with time.
HTH,
Tobin
KORE3
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