The 1956-1968 GM Car Turbo Hydromatic / 4-Speed 68" Screw On Speedometer Cable is a high-quality replacement designed to restore smooth, reliable speedometer operation in your classic GM vehicle. Measuring 68 inches in length, this cable is ideal for cars equipped with Turbo Hydromatic or 4-speed manual transmissions. It features a threaded screw-on end for secure connection to the transmission and speedometer head. Built with a durable inner cable and reinforced casing, it ensures consistent signal transfer and long service life—perfect for daily drivers or full restorations.
Installation:
Difficulty: 2/5 – Basic mechanical skill and hand tools required.
Instructions: Disconnect the battery. Remove the old cable from the transmission and the back of the speedometer. Route the new cable along the original path, avoiding sharp bends or hot surfaces. Screw the cable ends securely into the transmission and speedometer head. Reconnect the battery and test speedometer function during a short drive.
| Make | Model | Years |
| Buick | Skylark | 1964 - 1967 |
| Buick | Special | 1964 - 1967 |
| Chevrolet | Chevelle | 1964 - 1968 |
| Chevrolet | El Camino | 1964 - 1968 |
| Oldsmobile | Cutlass | 1964 - 1968 |
| Pontiac | GTO | 1964 - 1968 |
| Pontiac | Grand Prix | 1964 - 1977 |
| Pontiac | LeMans | 1964 - 1968 |
| Pontiac | Tempest | 1964 - 1968 |
| Part Type | Speedometer Cable |
| Proposition 65 | WARNING: Cancer and Reproductive Harm |
