12.7:1 Power Steering Box C10 Truck 67-87

The Detroit Speed Engineering 12.7:1 Power Steering Box for C10 trucks (1967–1987) replaces the original steering box with a modern power-assisted unit engineered for improved response and reduced steering effort across the full range of motion. This cast-iron steering box delivers the precision handling geometry that separates a competent classic truck from one that drives like a refined modern vehicle. The 12.7:1 ratio strikes the balance between quick steering response and the mechanical stability needed during highway cruising or aggressive off-road driving.

The 12.7-to-1 steering ratio means the steering wheel requires fewer rotations to achieve full lock-to-lock travel—a direct improvement over slower factory ratios that demanded three or more complete turns. Cast-iron construction ensures durability under sustained use, while the natural finish provides a clean appearance in engine bays where aesthetics matter. At 28.35 lbs, the unit integrates into existing C10 frame mounts without modification to suspension geometry or frame reinforcement. Power steering elimination of manual box resistance makes long-distance driving less fatiguing and parking maneuvers significantly easier, especially important on trucks with larger tires or wider track widths.

This upgrade suits C10 owners undertaking comprehensive frame-off restorations, modern driveline swaps, or drivers who retain their trucks as primary vehicles and value daily usability. The 800 Series designation indicates Detroit Speed's proven platform, developed and validated across thousands of installations in the classic Chevrolet truck market. Compatibility extends across 1967–1987 C10 full-size trucks, making this a mainstream upgrade rather than a niche component. Pairing this steering box with a modern power steering pump and hose kit transforms the driving experience while preserving the authentic appearance of a stock-style installation.