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I have a 2008 GMC Sierra 1500 crew cab z71. A few months ago, I noticed it was making a strange noise while maintaining a steady throttle while driving down the hwy. I even notice it when in cruise mode. It seems to go away when I speed up or slow down. It almost seems as if the truck shift and is lagging but it happens even at higher speeds. It is a low rubble. Any ideas? I had the transmission fluid changed by the dealer at 47000 and has 60000 now started around 57000. Also, I think it started after I shifted the truck from 2wheel to 4 hi and back. Took to dealer and they say 4x would register problem if it didn't shift back properly.

Appreciate the help


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Location: Oregon
I am not sure I can understand what you mean. Does your truck have a tach? Is the tach reading higher than normal at cruise? maybe the torque converter lock up is not locking up. Or are you feeling it's like the engine bogging down?

you should drive your vehicle with a scanner hooked up and see what the data stream shows. watch your fuel trims. you can also switch to watch the trans also.

Converter may be slowing up the exhaust flow.

If you hear a noise, does it sound mechanical? Where does the noise seem to be coming from? engine, trans, front, rear? you may need to go to a shop that a tech can go for a ride with you to hear and feel what you are describing. You might need to find a shop with a "chassis ear" to pinpoint the noise.


   
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