What did you do to your NBS GMT800 Tahoe/Yukon Today?

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Chubbs

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I hate to be like this but what does tc mean? Traction control? And where would it be located for me to even look at it. Sorry I'm mechanically inclined but this is my first Chevy v8. Thanks for the help

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Oooh. TC is transfer-case. It has an electric motor bolted on the front; when you push the button (auto4, L4, H4,) that little motor turns a shaft VS. you manually shifting an old school lever on the floor. That motor is programmed to the whole computer network in the truck. The piece inside of the motor that interprets & carries out the commands is the encoder ring. When the ring goes out, the TC transfer case will begin shifting without command.
 

M1Gunner

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W8TVI

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Thinking about changing things up. I think I might pull the curved lightbar and put a straight bar up on the roof rack, then put cab lights up top. Then I can replace the door seals and it should be a little quieter and, even better, won't leak!!!

I'd like to get a light bar for my truck, but I'm not sure how I'd route the power wire. What did you do?
 

MadDogDelpho

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Since it's right by the door, I just ran it down through the weeatherstripping and into the engine bay. I'll try to get a good pic in the morning.
 

Tonyrodz

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Wish I could repair this! Prob be easier to just replace the whole damn seat. That's my intention anyway. I need steps, bad. View attachment 182554

On a brighter note, found a kickA$$ deal on Craig's: case of 5w-30 2dexos full-syn for $30!! 12 F'n quarts. 1-years worth of top-shelf oil changes.


View attachment 182555

Even better a cold front just came into bigD! Wrenching weather.
That's actually easy to sew. It would look repaired, but as long as there's no material missing. If there is, then it would look puckered.
 

Cattivo

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Oooh. TC is transfer-case. It has an electric motor bolted on the front; when you push the button (auto4, L4, H4,) that little motor turns a shaft VS. you manually shifting an old school lever on the floor. That motor is programmed to the whole computer network in the truck. The piece inside of the motor that interprets & carries out the commands is the encoder ring. When the ring goes out, the TC transfer case will begin shifting without command.

Can the TC be repaired or would I have to get a new one? every button works accept for 4LO...It won't engage, it just blinks and returns to the previous gear from neutral when stopped or rolling down hill around 3mph
 

Chubbs

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Can the TC be repaired or would I have to get a new one? every button works accept for 4LO...It won't engage, it just blinks and returns to the previous gear from neutral when stopped or rolling down hill around 3mph

So you did attempt "4L0" mode with transmission shifted into NEUTRAL? Are you referring to the TC or T/M when you say 'from neutral?' If I'm not mistaken, the auto trans needs to be in "N"

if you don't hear any grinding or banging noise such as a mechanical hangup, replace the encoder ring and see if that works. If you or someone you know possesses a computer capable of updating/reprogramming the TCM, that may also work; it might even be required. I don't have any experience diagnosing this bad boy. SunlitComet possibly has a more definitive answer for you, but it seems like a faulty encoder or corrupted programming at the worst, barring any suspicious sounds.
 

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