Question about 2000 Chevrolet 2500

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When at idle i have a knocking noise coming from transmission or transfer case

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In park there are no moving parts in these compononents. id pay close attention to noise coming from exhaust or engine. if its engine suspect low oil psi due to sludge or bearing wear. other wise pay close attn to cat conv in exhast

Posted on Nov 15, 2009

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is it coming from the hubs on either of the front tires? Is it coming from under you in the transfer case or is it coming from the 4 wheel drive shifter? Once this is known, it becomes relatively self explanatory.

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88 Jeep Wagoneer is stuck in 4WD and something bangs and slips.


The transfer case is a chain driven unit and if the chain wears and gets slack or if some other component related to the chain fails it will "slip" over the sprocket teeth under a load making a banging sound as the chain binds. Find a flat blacktop parking lot, while in 4WD and in drive idle the vehicle slowly (at about 5 MPH) straight ahead. No noise? Now trun the vehicle as sharp as you can either dirrection (you may have to give it a little throttle to maintian speed) Now is it making the banging noise? If so it more than likely is the transfer case. Small debris can lock the transfer case in 4WD also. Hope this helps.

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Knocking noise when accelerating!! It's loudest when I first start my Jeep grande Cherokee leredo (2000) but then only happens when I step on the gas. Any ideas of what this could be. I do need my...


Knocking noise is generally from the engine. What is your oil pressure? If pressure is low and oil is reasonably full, refrain from driving it till the cause is determined. Noise can also come from the transmission or transfer case but more likely it's from the engine.It can come from sticking valve lifters (moderately bad to potentially serious) connecting rod or main crank bearings (always serious) or piston slap (annoying, expensive but not terribly serious unless very bad) Piston wristpins can also knock but are very rare in todays pistons. Either way, this is not an item to ignore.

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hi,better to bring your car to gas station with car lifter,lift your car ,you can determine where the noise come from,or maybe you can see the rotation of your proffeler shaft,ty

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4t60e transmission


I have the same condition. I have been told by a very good mechanic that I trust that the problem is the torque converter itself. It is locking up and unlocking when it should not. We found that if we raised the front end of the car off the ground, the tires would start spinning even though it was in park. In this case the converter was engaged. It is not clear if just changing the converter will solve the problem, but that is what we are going to try.

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the vehicle has to be put on a hoist. turn the driveshaft that goes to the rear wheels,it is driven by a transfer case that is almost in the middle of the vehicle,just rearward of the transmission.
if the noise comes from the transfer case,then that is the problem.
the drive shafts for the rear have universal joints which can develop play and give the same clunk.
if it is the transfer case,it needs to have a gear replaced.
always warm up the vehicle for enough time for the engine to come down to 1000rpm before putting in drive,the fast idle is over 2000rpm,and puts alot of stress on the drive components,and over time wear them prematurely.

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This is AC compressor rattle, don't worry about it unless it is really loud, in that case replace the compressor.

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