Question about 1992 Chevrolet C/K 2500

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I have a 92 chevy k/2500 4x4 350 eng.w/tbi and the transmission is a turbo 400.i have no passing gear.what can i do to get kickdown.also i get 2 stories on what tranny came in the truck orig.i have a 4 pin connector on one side and a 2 pin on the other.i'm also open to other ideas on getting the kickdown to work. thx,richard

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There should be a kick down cable coming from the tranny to the tbi, this is probale out of adjustment, or the tranny is having issues, this can be fixed by losing the cable. now take the throttle and open it wide open the cable should click. i would think that this truck should have the 700r4 tranny

Posted on Sep 28, 2009

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1 Answer

What would cause a turbo 400 transmission to not go into any gear until it wants to. It will sit for any length of time and then go into gear. after that it shifts fine until you shut the truck...


Sounds like a blocked transmission oil filter or front oil pump problem. Have you had the transmission serviced (e.g. flushed with fluid and filter replaced)?

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Kickdown cable unhooked, attaches next to accelerator petal cable.

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The cable on the 90 Suburban is not a kick-down cable, it is a TV cable (Throttle Valve) cable and it controls the amount of fluid line pressure through the transmission according to the throttle position, and if it is not properly adjusted the transmission will have shifting problems and it will lead to early failure of the transmission.

The electrical connection on the side of the transmission is for the electrical solenoids inside of the transmission that the computer uses to monitor and control the shifting and the kick-down.

The best thing for that truck would be a good Turbo 400 transmission.

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Do you have a 1 piece case or does the bell housing unbolt? A 700R4 usually has 3 switches on the back of the valve body.the one closest to the 1-2 accumulator (pass. side rear corner) is the fourth switch. If you have a two piece case, you have a 4L60E,the pressure switch is still on the valve body but it is an assembly,not a single switch.

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Your transmission has 3 shift rails...
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If your 3rd gear doesn't work , you have an internal transmission problem, such as a syncronizer, or similar fail... There is not much you can fix, without removeing the transmission.

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You could have a bad gasket under the TBI that is allowing uncontrolled air to enter the engine or an Idle Air Control Motor that is not working properly.

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that was old school , vehicles with the turbo 400 transmission are equipped with an ECM controlled downshift system , when vehicle is at speeds below 70 mph a forced (detent) downshift is possible by fully depressing the accelerator ,when the ECM detects a drop in manifold vacuum (high map sensor reading) the downshift control relay is energized by the ECM , the relay detects battery voltage to the detent solenoid in the transmission to open open an oriface to force the transmission to downshift ..... if yours is not working i would first check the downshift relay , under hood , picture is so bad i can't tell , looks like on the firewall more to the passenger side , next to fuel pump relay , if it needs more diag than that maybe you should get an estimate for repair from a trans shop or such , hope ya fix it , cheers .

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