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07 silverado loud noise from bellhousing


spankrz

Question

Truck has 163,000 miles, it is a 07 nnbs silverado 1500 5.3 4l60e. It ran and drove perfectly until yesterday. Under normal driving conditions around 50 mph it started making a very loud knocking noise coming from the bellhousing. Noise is present at idle not moving, and gets worse under acceleration. Runs and drives and seems to shift correctly, but a slight vibration and slightly reduce power. No codes present. What are the possibilities for thease symptoms? Cracked flywheel? Tourque converter loose? Any help is greatly appreciated.

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6 answers to this question

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good info on that, i am used to the old setups. i set the truck up on jackstands last night but did not get a chance to look at it, too much schoolwork. hopefully within a few hours i will get caught up enough to go out and look at it.

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Could be an internal failure in the torque converter, or the pump bushing, or pump itself. Never saw a torque converter fail with a stock engine, but these days anything's possible.

 

I'll let the guys that work on these new ones take it from here .....

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Miss the days when you could just drop the cover and check for that ...

 

You still can, but you'd have to remove the starter ...

 

Not a biggie, but was much easier with a cover!

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im going to try to pull the cover off tonight to look at it, my main problem is trying to find the time between full-time university classes and running my own business... i am really hopeful that it is something simple like a bolt backing out of the converter because this is my only running vehicle and i am pretty short on cash to make the repairs. if it is anything more then the converter or flywheel needing replaced i will be in a pinch. thanks for the replies and i welcome any more thoughts on the subject.

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What I was trying to say above is, there's no cover nowadays - it's one solid chunk of aluminum with the tranny case. You can see a little inspection cover in the pic - that you CAN remove, but it's not the whole cover like in days gone by. Removing the starter provides a better view ... and if the bolts indeed are loose, you'll have to do that to tighten them anyway.

 

 

Silveradobellhousingtransmission.jpg

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