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TCI 376600 Universal Lockup Wiring Kit For Use With 2004R/700R4 Transmissions


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376600 Universal Lockup Wiring Kit For Use With 2004R/700R4 Transmissions
8 left in stock
Universal Lockup Wiring Kit
  • For Use With 2004R/700R4 Transmissions
  • Includes Gasket, Wiring Harness, Vacuum Switch, 4th Gear Pressure Switch, Splice Connectors, Mounting Screw, Instructions
  • Ships

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    376600 is rated 4.4 out of 5 by 11.
    Rated 5 out of 5 by from TCI shift kit It made my transmission act like a completely different transmission in a good way I love it
    Date published: 2021-06-29
    Rated 5 out of 5 by from Fast delivery and easy to install, highly recommend.
    Date published: 2017-10-10
    Rated 5 out of 5 by from Nice kit Good deal for the price. Reasonably easy to install, works well.
    Date published: 2017-05-15
    Rated 5 out of 5 by from performance Great service with the right part delivered fast, nuff said
    Date published: 2016-08-24
    Rated 5 out of 5 by from it works!! this kit increased my gas mileage by lowering my engine rpm.
    Date published: 2015-11-29
    Rated 5 out of 5 by from Lock up kit I bought this kit a couple months ago when I converted from a TH350 transmission to a 700R4 on my 83 El Camino. After researching and seeing the great reviews for the kit, the price and free shipping from Jegs couldn't be beat. So far, I haven't had any problems and it has been working great!
    Date published: 2015-09-06
    Rated 5 out of 5 by from Bought this kit couple mts ago have a 1990 suburban v2500 born with a turbo trans so no lock up in computer this kit works great I tow a lot so manual lock up helps in gas m ok page plus keeps revs even would recommend it to anyone with a 700 r 4 transplant easy to install also
    Date published: 2014-11-02
    Rated 4 out of 5 by from Went from an erratic lockup to a fantastic lockup This concept is a very good idea. I installed on my 1987 chevy truck which is the first year for the first computer. I had to do a few items to my truck to make this system work good. With the vacuum line going down to the vacuum switch the vacuum changed so fast the lockup was happening on just a little hill. I tried setting the switch with the little set screw but could not get it set and also wanted to porpoise. I bought a more precision vacuum switch with a contact block and mounted it in the truck so I could set it from inside. I bought a vacuum reservoir so the vacuum would not be so quick on the response. With all of the vacuum line and reservoir it was to slow on the response. I moved the reservoir right above the engine away from the heat and that eliminated a lot of the vacuum line and piped it to the new switch. Wired in the ground through the new vacuum switch block and ran that to the transmission. I set the new switch at about 11 vacuum which allowed the truck to get at a pretty good speed before the lockup torque converter would lock up. I installed a tack and vacuum gauge next to the new switch so I could watch the tack and vacuum. I also installed a toggle switch between the ground going to the transmission so if you are around town or where you are traveling at a speed where the 4 shift would take place but do not need the lockup to come in at that time = I have a way to keep it from locking up. It works fantastic now after all of this = but it was worth it. I have a gear splitter transmission hooked onto my 700R4 and with those two transmissions working right and now the lockup working good = I get fantastic gas mileage. At 70 miles and air and the torque converter lockup and the second transmission in and even with a 373 gear I am only turning 1600 RPM'S. Converting to this vacuum setup is one of the best items I have done to my old chevy truck which has 418,000 miles on it and all original except the second engine and the second transmission. I know this is long but this is what I had to do to make it the way I wanted it to work.
    Date published: 2022-05-26
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    can I use it on a th350c

    Asked by: Michael Mathiesen
    The TCI 890-376600 wire kit does not work with a TH350C.
    Answered by: jshook
    Date published: 2023-11-03
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