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Vehicle Info NeededReplacement Vacuum Switch From TCI Kit #890-376600
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Lowest Price Guarantee- Replacement Vacuum Switch
- From TCI Kit #890-376600
TCI's 2004R / 700R4 Universal Lockup Wiring Kit provides hands-free, automatic activation of the torque converter clutch in 4th gear and will disengage the clutch when you accelerate or down shift. This easy-to-install, universal lockup wiring kit makes it possible for you to install a GM 700R4 or 2004R transmission into a non-computer controlled street rod or muscle car. It is also beneficial when removing a factory computer in pre-1993 vehicles with a 700R4 or 2004R transmission. This kit contains quality OE connectors and oil-resistant wire. Kit comes complete with a gasket, wiring harness, vacuum switch, 4th gear pressure switch, splice connectors, mounting screw, and detailed instructions.
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Features- Fully adjustable vacuum switch automatically locks and unlocks the converter with engine vacuum
- Manual override allows complete control over lockup
- Constructed with OE connectors and oil-resistant wire
- Simple installation requires only general mechanical knowledge
- Improves Fuel Economy
- Increases Control Over Torque Converter Clutch Lockup Note: Supplied with 700R4 pan gasket only.
Take your 200-4R or 700R4 transmission setup from basic to brilliant with the TCI Universal Lockup Wiring Kit — engineered for smoother performance, improved fuel economy, and hassle-free operation. If you’re using one of these transmissions in a non-ECM or vintage application, this kit fills in the gaps so torque converter lock-up behaves just like newer systems.
This kit allows automatic, hands-free activation of the torque converter clutch (TCC) in 4th gear under steady load — and it disengages when accelerating or downshifting — giving you confident control over lockup without the guesswork. A fully adjustable vacuum switch lets you fine-tune the vacuum threshold at which lockup occurs, ensuring compatibility with your engine’s vacuum curve. There’s also a manual override option so you can take control when you want.
Built to be robust and installable by the enthusiast, the kit includes OEM-quality connectors, a wiring harness, vacuum switch, 4th-gear pressure switch, splice connectors, and a mounting screw — everything needed for a clean, reliable install. The design ensures compatibility with both 200-4R and 700R4 transmissions, making this a universal go-to choice.
Whether you’re restoring a classic, building a street rod, or updating a muscle car drivetrain, the 2004r lockup kit helps eliminate slippage, reduce heat, and provide steadier highway performance. For anyone reworking or upgrading factory systems, having the 700r4 lockup wiring diagram or 700r4 wiring schematic in hand plus this kit means less guesswork and more confidence. Invest in this upgrade and drive with more control, efficiency, and peace of mind.
