![]() 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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