![]() ![]() 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. took me two days to figure all this out as it was my first real mod.I’ve got a 700-R4 in my Chevy C10 pickup behind a typical 383ci small-block Chevy. the 700r TV cable housing will not fit the 350 turbo all you need is a cable stop from any hardware store and switch out the ends at the motor side bracket that's all. also I spliced the kick down cable with the TV cable so it would work with my brackets.cheap but effective. I have a 88 Tbi 5.7 pickup that I backdated to th350 from 700r electric speedo I just wanted to state that the tail shaft housings will interchange and all you have to do is nab the speedo gear off of the 700r I did so with a lack of tools so I used a 2x4 and a hammer but needless to say it worked and that's the only snag I ran into for the back date except the crossmember which I had to notch and drill a couple holes in the frame.easy peasy I pull heavy loads and will never own another 700r again.oh one more thing.the vacuum.tee off of the map sensor from the manifold port on the back side of the Tbi and you will be fine be sure to use a steel line. ![]() also late 350s had a locking torque converter(adds an electrical ciruit) in an effort to improve fuel economy (but they also cut the weight out of some of the internal rotating elements at the same to reduce weight)some would say and reliability i'd call it an easy swap for any back yard mechanic certainly much easier than what you need to know to repair cars of only one decade later this causes a little alinement issue with the shift shaft in some applicatinos but it will work other than having either not enough positions or too many on the shift quadrant, and you better hope that you are swapping out an early 700 with a speedo cable as some later units(i think) had a speed sensor that means finding a new tailshaft cone and gears to drive the speedo cable there is a cable operated shift control on both transmissions and a vacuume operated pressure control on the 350 that warrants some understanding. 350 hydromatics come in 3 tailshaft lenths (sic) 6 inch 9 and 12 they have the same output spline flexplate bolt pattern and engine mounting pattern to swap out a 700 r4 you need a 9 inch you will have to move the transmission support forward several inches.
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