This is especially crucial because it is this cable movement that signals the transmission that there is load applied to the transmission. This bracket repositions the TV cable throttle linkage point to duplicate the TV cable OE movement required by the 700-R4 transmission throttle valve. Now we need a simple TV adapter that bolts to the side of the Holley carburetor primary throttle linkage ( PN 20-121). The next step is to connect the cable to the transmission to make sure it is correctly attached to the transmission TV valve. We’ve found a simple bracket by Holley (PN 20-95) works well to create a secure place to mount a universal TV cable. The parts we’ll be using are straight from Holley.įirst we need a place to securely mount the TV cable to the manifold and carburetor to create a stable platform from which this cable can operate. So we’ve landed on a couple of products that work for us and also will be easy for you to adapt to your particular application of a Holley carb on a dual plane intake manifold. There are entirely too many kits to list them all here and we frankly don’t have the resources to test them to determine how well they work. To simplify things, several manufacturers like Holley and Edelbrock have come up with mounting kits. Most often this also means that we will need a mount to position the TV cable assembly next to the carburetor. It is critical that the placement of the TV cable on the throttle linkage be accurately placed to duplicate the OE movement of the throttle as it opens. Aftermarket carburetors like a Holley or an Edelbrock do not create a proper locating position for the TV cable because these carburetors were designed and built before the TV cable was created. Problems arise when hot rodders start changing components like carburetors or intake manifolds. As the throttle opens, this pulls on the cable which moves the throttle valve inside the transmission valve body and increases line pressure.Īll of this works very well in the stock OE configurations because the GM engineers worked out the details. On the other end, the cable is directly attached to the throttle valve that adjusts line pressure in the transmission, much like the vacuum modulator did on earlier automatics. On the top of the engine, the TV cable is connected to the throttle arm on the carburetor or throttle body if the engine is EFI. The TV cable on the 700-R4 and its cousin the 200-4R overdrive transmissions replaced the old vacuum modulator valve as the device used by the transmission to sense the load applied to the transmission. This is a complex issue with a ton of other potential causes but we’re going to go with the best option of making sure the TV cable is properly adjusted because this is often where big problems begin. This sounds like a classic case of an incorrectly adjusted TV cable. Yes and hopefully you have not hurt the transmission in the process. We were thinking that maybe the torque converter is a little too soft and that’s causing the weak shifts. My problem is the transmission doesn’t seem to be as strong on the up shifts as it should be. The engine runs fine with a set of Edelbrock heads and Performer RPM intake and a Holley 750 vacuum secondary carburetor. I’ve got a 700-R4 in my Chevy C10 pickup behind a typical 383ci small-block Chevy.
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