Question about 2001 Chevrolet Silverado 2500HD
After starting my 2001 Chevrolet Silverado 2500 HD with Allison transmission 8.1 liter engine, I get a clanking noise that goes away after 7 to 10 minutes warming it in driveway. I can only describe the noise which sounds like a fan touching on something as it turns. It goes into drive ok & seems to shift just fine while driving the truck. Seems to only make the noise when it is cold. I recently (6 months ago) had the transmission serviced where the pan was dropped & fluid replaced. The truck only has 49,500 miles on it & is not driven very often. In fact is parked most of the time as you can see by the low mileage. Truck drives great on road...no more noise can be heard & shift just fine. Can be reached at firstname.lastname@example.org regular e-mail.......Thank You
This does sound like theres a loose line tapping the engine/frame,during warm up the engine idles faster which could make it vibrate faster causing the the clanking or tapping noise,if this has started after trans fluid change,then check the lines running from the trani to radiator sometimes the service person might bang into something causing plastic clips that hold the lines to break,try getting under it and have someone start the truck and listen to see where it's coming from also hold the lines & see if the noise stops,the service guy could have unbolted something & never put the bolt back causing the clank ex.line may have a clip holding it thats bolted to the trani pan ?good luck
Posted on Dec 29, 2012
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Posted on Jan 02, 2017
yes the front sensor will collect metal shavings causing this same problem.however you need to have it scanned when the lights are on. auto zone scans for free. the front sensors are in the front hubs. replace as a set as assymblies.
Posted on Dec 30, 2009
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Hello. try a couple of things. make sure the rad is clean from any road debris or dirt. in fact, take a garen hose and pressure wash the rad and condensor fins real well. also miaght have both of the trans filters replaced. there is one inside the trans pan, and one spin on trans filter.
Posted on Jun 19, 2010
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