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I am installing a 5.0 Mustang motor in my 85' 4Runner, (engine and drivetrain installed, NV4500 trans, dual t-case crawler box, with external parking brake at driveshaft). The discussion at hand is how far should the clutch rod move into the master clutch cylinder in relation to the slave cylinder movement to move the clutch rod via the clutch fork. Another way to look at this is once the throw-out bearing makes contact to the clutch pressure plate fingers, how far should the clutchfork move in to disengage the clutch properly? Notes: F150 Bellhousing, Luke pressure plate, 11" Centerforce clutch disk, special Advance Adapters pilot bearing, Throw-out bearing?, Clutch slave assembly Raybestos SC37745, Clutch master cylinder assembly Raybestos CMA39560 kit including preformed fluid line (for late model Jeep), custom slave cylinder support, custom slave cylinder rod about 8.5" long, highly modified clutch fork (shortened about 1"). "This discussion might involve leverage and physics volume of pistons, fluid displacement and pedal lever force" as Moses suggested.