1977-1980 C3 Automatic Transmission Cooling Lines TBW T350
Years of heat cycling, road grime, and internal corrosion can quietly ruin your Corvette’s original transmission cooling lines. Restore safe fluid flow and factory-correct routing with this OE-style Tin Bundy Weld (TBW) transmission line set, designed for 1977–1980 C3 Corvettes equipped with a 350ci small block and T350 automatic transmission. These lines connect your radiator to the transmission, circulating ATF fluid to maintain temperature and protect against drivetrain damage. Pre-bent to factory specs and made with original-style materials, these steel lines are the reliable upgrade your C3 deserves.
Features
• Correct for 1977–1980 C3 Corvettes with 350ci engine and T350 automatic transmission
• Pre-bent steel tubing for factory routing and clean installation
• Tin Bundy Weld (TBW) construction replicates original GM line material
• Provides proper ATF circulation from radiator to transmission
• Resists rust, vibration fatigue, and ethanol-related degradation
• Installs directly without modification
Tech Notes
GM used Tin Bundy Weld (TBW) tubing on all factory transmission and fuel lines through this era. The TBW process creates a strong brazed seam that resists corrosion and retains flexibility—critical for chassis-mounted components like trans cooler lines.
Because Details Matter
Replacing tired transmission lines preserves not just performance, but presentation. This TBW line set adds factory accuracy, OE fitment, and dependable function to your late C3’s underbody.
Installation Note
For proper routing and secure mounting, we recommend pairing these lines with our factory-style line clip set. Have line wrenches, a catch pan, and fresh ATF fluid ready before installation.
Also known under these part numbers: (For reference only)