During the chase, after Bullitt misses a turn and does a reverse burnout, only the right rear tire "burns rubber" as he drives away from camera. This indicates that the Mustang was not equipped with a limited-slip differential (the gears that transfer power from the driveshaft to the rear axle half-shafts). Both "open" and "limited-slip" diffs allow the wheels to rotate at different speeds in corners for efficiency and comfort. An open diff will allow the wheel with less grip to spin under high load (or on low friction surfaces). But a limited-slip diff balances the power between left and right wheels when traction is lost on one or both sides. The Mustang would have done a two-wheel burnout if it were equipped with a limited-slip differential.

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