1968-1974 C3 Automatic Transmission Cooling Lines TBW T350 T400
Over time, the transmission cooling lines on your 1968–1974 Corvette take a beating—exposed to heat, road debris, and internal corrosion. These OE-style Tin Bundy Weld (TBW) steel lines restore critical fluid circulation from your radiator to transmission, keeping your T350 or T400 automatic transmission running cool and shifting reliably. Whether you're driving a 327, 350, or 427-equipped car, this TBW line set is pre-bent to match factory specifications for a hassle-free fit and factory-style appearance.
Features
• Correct for 1968–1974 C3 Corvettes with T350 or T400 automatic transmissions
• Fits small block 327, 350 and big block 427 engine configurations
• Tin Bundy Weld (TBW) steel tubing replicates OE manufacturing
• Factory-style bends for proper routing from radiator to transmission
• Designed for thermal regulation and smooth fluid circulation
• Durable, corrosion-resistant lines with direct bolt-in fit
Tech Notes
Tin Bundy Weld (TBW) tubing was original equipment on Corvette fuel and transmission systems. The brazed seam construction improves internal smoothness, reduces brittleness, and enhances resistance to corrosion—ideal for long-term durability and performance.
Because Details Matter
Transmission cooling is essential for preserving drivability and preventing costly wear. These TBW steel lines restore original function and routing accuracy—exactly how Chevrolet engineered them to perform.
Installation Note
We recommend pairing these lines with our factory-style line clips to ensure proper underbody support and secure frame attachment. If you're installing these at home, have line wrenches, transmission fluid, and a catch pan on hand for a smooth job.
Also known under these part numbers: (For reference only)