TCI Auto Automatic Transmission Lock-Up Torque Converter Switch
TCI Auto 376600 Universal Lock-Up Wiring Kit for GM 700R4 2004R Transmissions
About TCI Auto
TCI Automotive has built a decades-long reputation as one of the most respected names in high-performance drivetrain technology. As a leading provider of high-performance automatic transmissions, torque converters, and drivetrain components, TCI serves the race, street/strip, hot rod, street rod, and towing markets. Whether you're chasing quarter-mile glory or building the ultimate weekend cruiser, TCI's engineering-first approach means every part is designed to handle real-world abuse.
Built by Racers, Tested on the Track
Designed, built, and tested by hardcore racers and enthusiasts, TCI transmission products are specifically engineered to crank out race-winning power mile after grueling mile, run after punishing run. That philosophy extends across their entire product lineup — from complete transmissions and torque converters down to the smallest supporting components.
With 35+ years of on-track experience, TCI applies a meticulous quality control process where each precision-built part is checked by in-house QC experts. Every transmission and valve body is both hydraulic-circuit and dyno tested; every converter is leak-checked and computer balanced. This commitment to quality means you can trust a TCI component whether it's heading to the dragstrip or hauling a trailer down the interstate.
TCI's Core Product Categories
TCI Automotive manufactures high-performance automotive parts including transmissions, torque converters, shifters, flywheels and flexplates, transmission controllers, fluids, and supporting components for street, race, truck, Jeep, and off-road applications.
One of TCI's most popular product segments is their lineup of transmission fluid pans. One of the best investments you can make to ensure the longevity of your automatic transmission is a TCI cast aluminum deep pan — designed with cooling fins to dissipate heat quickly while providing additional strength and rigidity to the transmission case. These pans are available for a wide range of popular GM, Ford, and Chrysler automatic transmissions.
Keeping your transmission fluid level accurate is equally important, which is why TCI offers automatic transmission dipsticks engineered to work seamlessly with their pan and transmission fitments. Their locking dipstick designs help prevent accidental removal and fluid contamination — a small detail that makes a big difference in performance longevity.
When it comes to connecting the engine to the transmission, TCI's automatic transmission flexplates are a trusted choice among serious builders. For serious performance applications, TCI machined SFI-approved flexplates are a "must have" — constructed of A514 Blanchard ground steel at .140 in. thick and SFI 29.1 approved. TCI offers a complete line of Chrysler and Ford flexplates with GM and Ford bolt patterns for use with their adapter plate kits, as well as neutral balanced flexplates with 168-tooth and 166-tooth starter rings for Chevy and Pontiac applications.
For builders who want precise throttle-to-transmission communication, TCI's automatic transmission shifter cable kits and TV cable assemblies provide the linkage needed to keep shift points dialed in correctly. Paired with TCI's automatic transmission shift micro switches, these components give you the control needed for consistent, repeatable shifts — whether on the street or staging lanes.
The TCI Difference
From a single replacement dipstick to a complete high-performance drivetrain build, TCI Automotive delivers the engineering depth and product breadth that performance enthusiasts demand. Their parts are designed to work together as a system, making TCI a go-to brand for builders who don't want to compromise.