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!!
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.
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
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It's about time to change plugs!!!!!! They normally get changed at 100K. If you have the 6 cylinder engine, there are no wires, the coil pack just sit on top of the plugs. Have you ever done any of the fluid changes on the differentials and the transfer case? Transfer case needs to be done every 50K and diffs every 100K.
Being a ss, sounds like your AWD transfer case if it was never serviced may be worn out and will need to be replaced. The other area that would cause the same issues you have described would be a bad CV join or U joint.
Start with the simple and inspect your CV and U joints. If all seem to be in 100% working order, then move on to inspecting your transfer case and front differential.
What you may be hearing is the wheel bearings instead of the transfer case. I had this problem with GM before and found it to be the wheel bearing was bad. I know it is not what you think, but it would be an easy thing to check first.
I just had my transfer case rebuilt on my 2002 2500 silverado duramax. They told me that the spring that holds the pump inplace in the transfer case wore a hold through the case. He said this was common on these transfer cases. Chevy has not acknowledge the problem. He designed a steel plate, with flanges that holds the pump in place and will not wear a hole in the case again. And as far as the post to engage it once a month, the chain turns even when in 2WHL drive.
It isn't too bad if you have done wrenching on other things.
Both driveshafts need to come off,
the crossmember and mount need to come off,
I believe the Y pipe or the left side of the Y pipe need to come off as they are in the way,
a few wiring connections,
support the trans at a certain height so the tranfer case isn't sitting on the rear crossmember, remove the six bots on the front of the transfer case, slide backward off the splines and tip the front downward and out.
You mean between the case halves? It is just silicon, no gasket. These are good for the pump wearing a hole in the rear housing and leaking oil. The cure for it is a new rear housing and a piece called a case saver that keeps the pump from doing it again. Taking the transfer case apart to fix it is easy, I can tell you how to do it.
well make sure it is the tranfercase because if it was u wouldent have 4wd and u wouldent be able to drive it but it would be cheper to rebuild it but make sure first because some people are just out for your money good luck
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