![]() If it's wrong, you'll have to loosen the 8mm bolts and lengthen (makes the stroke longer) or shorten the arm until the stroke length is correct, and then re-check the free play. Step 2: hold the accelerator open as far as it'll go, check that the cable stop is now 34 - 35mm from the outer cable/adjuster tube (as pictured). Step 1: With the accelerator at rest (idling position) pull back the orange boot and check that the inner cable stopper is 1-2mm away from the outer cable/adjuster tube: almost touching but not quite. When the throttle hits WOT, the switch will complete the circuit and 12-volts will be supplied to the internal solenoid in the TH400 trans which increases line pressure and changes the shift characteristics of the trans.There are two cable adjustments: the 14mm adjusting nuts on the cable outer sheath set the overall position (in theory these should be the only ones you need to touch), and the two 8mm bolts on the linkage arm adjust the arm length and therefore the cable stroke (these shouldn't need adjusting unless someone's been fiddling.) Run a wire from the second connection on the switch directly to the electrical connection on the transmission. Place one wire from a switched, 12-volt positive source on one side of the micro-switch. With regard to wiring, it’s really simple. Chevrolet used a switch mounted off the throttle pedal assembly on a 1970 Chevelle to trigger the TH400 kickdownso you might be able to look at one of these mounts to get an idea how to make one. We’ll also assume your pickup uses a cable throttle assembly – so it should not be difficult to build a small bracket that can mount a simple microswitchthat would be triggered as the pedal linkage reaches wide-open-throttle (WOT). ![]() Jeff Smith: We’re going to assume that you have a cable-actuated throttle linkage for your 5.3L LS truck engine. How do I do this so I don’t hurt the trans? ![]() ![]() We bolted a TH400 transmission to the LS engine but I now realize that I don’t have any way to trigger the kickdown linkage on the TH400 trans. I have an ’85 C-10 pickup that we’ve installed a factory fuel-injected 5.3L truck engine. ![]()
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