Question about Chevrolet Suburban 2500
I have a 1996, 2500, 6.5 ltr. 4wd, turbo deisel Suburban. It is making a noise from the mid-cabin as if two gears were making near contact. It is a metal on metal sound when it is under power and only when in two wheel drive, especially if under torque (like running up hill). If we put it in 4 wheel, it seems to stop. There looks to be some sort of transfer case that is in the area where the noise seems to be coming from. Does anyone know about what could be the cause? I feel as though it is a celenoid issue where it is not shifting in and out of 2wd and 4wd completely. Any help on this?
Most probably wheel bearings or it might be the axle if it is front wheel drive.
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Posted on Jul 19, 2010
The transfer case needs to be removed and checked.
Remove the transfer case and check it.internally. The procedure to remove the transfer case is as follows:-- crawl under the truck you will see the bolt pattern facing the front of the truck should be 15mm and they will be in a circle pattern between the transmission and transfer case .that is where you remove it.You will have to take the things off as to remove the transfer case. --- In some cases its noticed that transfer case motor gets faulty. In this system the transfer case motor must engage first, then a signal is sent to engage the front differential motor to engage the differential. I think the problem is one of two items, either the front differential engagement motor is in-op or the transfer case motor is malfunctioning and sending false signals to the VCM (vehicle control module). If the front axle for any reason does not allow the front propeller shaft to spin while in the 2WD setting, the clutch pack in the transfer case will overheat because of the speed difference (slip) across the clutch pack between the stationary front driveshaft and the rotating rear driveshaft. the front axle, the transfer case should also be inspected for overheating by inspecting for burned fluid or a free rotating front driveshaft. In addition to correcting front axle concerns, necessary repairs should be made to the transfer case. The auto locking hubs are not engaging properly and will need to be removed and spline sets checked for broken teeth on locking hub and locking shaft. Also check that the engaging spring inside the hub has enough tension to engage the hubs they may be broken. If the hub are all ok then you have a problem in the transfer box, where the 4WD lever is not meshing the transfer box properly. POSSIBLE THE ACTUATOR ON THE FRONT AXLE IS BAD ? YOU NEED TO SEE IF THE FRONT DRIVE SHAFT IS ROTATING WHEN THE 4 HI IS ENGAGED WITH OUT RUNNING YOUR SELF OVER IN THE PROCESS.
THERE IS AN ACTUATOR ON THE FRONT AXLE AN ONE ON THE TRANSFER CASE, THE ONE ON THE TRANSFER CASE LOCKS THE DRIVE SHAFT IN AND OUT OF 4 HI & 4 LOW. THE ACTUATOR ON THE FRONT AXLE LOCKS THE FRONT DRIVE SHAFT IN.
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Posted on Jul 18, 2010
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Posted on Jan 02, 2017
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