Ring Gear Pattern & Backlash Bulletin 5717-A with 0-1" Micrometer - Ford Bronco

This image is a photograph of a precision 0–1 inch outside micrometer (0.0001" resolution, digit-counter type, marked 'inch.') laid on top of a printed technical bulletin identified in the footer as Bulletin 5717-A, dated 5/02. The visible portions of the bulletin relate to ring gear tooth machining/pattern interpretation, with headings for 'RING GE[AR]', 'FACE MILLING', and what appears to be 'HOBBING', along with small diagrams of gear tooth profiles referencing dimensions A and B. The bulletin is trilingual: a partially visible English NOTE warns that when making changes with backlash set correctly to specification, the backlash may need to be readjusted to the correct value, and refers the reader to pattern interpretation. Parallel Spanish (NOTA) and French (REMARQUE) paragraphs convey the same guidance about checking pinion position and backlash before evaluating the gear contact pattern. Much of the text is obscured by the micrometer, cut off at the page edges, or printed sideways. The document was uploaded to a 1989 Ford Bronco gallery alongside 'pnumatic chart' images, and appears to be a differential ring-and-pinion setup reference used with the measuring tool shown; it contains no fuse, wiring, or torque data legible in this photo.