Question about 2003 Chevrolet Silverado 1500

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Transer Case; 2003 Silverado, Z71/4x4 (NP246)

The other day I was cruising about 35mph when all of a sudden the transfer case (I believe) started cluncking, and the my truck started slowing down. Winding down to be more specific. It felt like what happens when you go from "D" (drive) to L1. The clunking was speed related. Even when I slowed to 1mph the clunking was still there. It also did it in reverse. Desprite to get home I continued on, slowing increasing my speed. It eventually went away. But, it has happened a hand full of times again since then. AAMCO couldn't "duplicate customers concern." So, no help there. Another time, after driving on the highway for about 30 minutes, I came to a stop and as soon as I stopped the truck lundged forward and it sounded like the transfer case shifted gears. This all sucks cuz AAMCO doesn't want to take it apart until they can duplicate the problem. Good I guess, but the whole thing is driving me crazy!!

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Check to see if you have a pin hole leak on the passenger side of the transfer case, it will be blue in color, it is caused by a PUMP RUB issue that Chevrolet refuses to acknowledge. It will be located the 5th. bolt up from the bottom, you may be very low on fluid. For an easy fix, clean and grind slightly and place JB weld at the hole. Let me know if this is the problem. I used this technique on my 2003 avalanche and it has held for 8000 miles with no reacurrence.

Brad

Posted on Dec 22, 2008

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Should be pretty easy to find. Clunking would definetly be metal on metal causing some sort of metalic flake in the transfer case, transmission or axles. You would think that AAMCO would have checked fluids for this. Pull your fill ports on your differentials. They should be magnetic and have metal flakes stuck to them. If not then your transfer cas will have a fill port too. Check the trans with the dipstick. Grab the rear driveline and front driveline and try to move them with the truck stopped, twisting them back and forth

Posted on Dec 16, 2008

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Hey is the JB weld fix still holding up?

Posted on Aug 09, 2010

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Engine is missing under acceleration, once hot, it misses just cruising on the highway. I have 173K miles, original plugs and wires and such. I have have had no problems until just the last 2 days. Came...


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1 Answer

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i would check both ways first and see what the mechanical rate is in your area take it to a auto body dealership to have it done cahrges are 85.00 to 110.00at the dealership or private shops ok Please rate my response thank you very much

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