How To Adjust The Tv Cable on a GMC Syclone & Typhoon
The TV (throttle valve) cable on the 700R4 (and 200-4R) transmissions help control line pressure, shift points, part throttle downshifts, and detent (WOT) downshifts. So if the TV cable is not adjusted properly or if it has become streched, it can cause odd shift patterns or other transmission problems.
If your TV cable is bent, frayed, or damaged in any way that it is sticking, binding or restricting any sort of movement to allow functionality, this article will not help you. Replace your TV cable.
This article covers the proper technique test and adjust the TV Cable on the 1991-93 GMC Syclone and Typhoon.
- No tools required
Testing the TV Cable
In a safe location, take off from a stop at minimum throttle. - NOT BOOST LAUNCH!
Let the 1-2 shift occur, and immediately after the 1-2 shift, FLOOR IT.
The trans MUST downshift back into first gear. If it does, your TV set-up is fine and no need to adjust. If your trans DOES NOT downshift back into 1st gear, continue with adjustment.
Adjusting the TV Cable
With the engine off, depress and hold down the metal re-adjust tab at the engine end of the TV cable.
While still depressing the tab, move the slider until it stops against the fitting.
Release the re-adjustment tab.
Rotate the throttle lever to its full travel position - Wide Open Throttle (WOT). The slider must ratchet toward the level when the lever is rotated to its full travel position.
Once you have reached the WOT position, you can now let the throttle lever go back into closed position. Do this by hand, DO NOT just let go of the lever and let it snap back - you can potentially get your fingers caught.
Road test your truck. Make any further adjustments needed.
Want to learn more about how a TV cable works? Read this article.