There is a vibrating in the transfer case area after the truck has warmed up. I have had the transfer case replaced and the clutches rebuilt.New fluid put in which is blue in color and not cheap.It also has new bearings in the front end and rear end,new brakes and calibers in front and back and new hubs and wheel bearings in the front, also a new encoder motor replaced three times. For some reason there is a binding noise coming from the transfer case area like the truck is trying to go into four wheel drive and I do know its all wheel drive truck, but thats the best way I can explain what is happening to it. Does anyone have any idea what it might be?
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This type of vibration is typically caused by a bad universal joint on the drive line. I've seen a case where a bad u-joint caused the transfer case to crack and explode. Replace all the u-joints on the front and rear drive lines. They are usually only around 15 bucks each at NAPA and will be much cheaper than another T-case.
Check to see if the steering sector is about to fall off,and the power steering pump.If all that is secure,check the mounts on the trans,and the transfer case.If the mounts are broken,or weak,this would allow the vibration,when turning.Let me know if I can help any firstname.lastname@example.org
that could cause the vibration but I have also seen brand new tires out of the blue seperate or through wheel weights and cause dashes to vibrate so I would eliminate that completly from the equation.It wont cost you anything if where you had them installed does lifetime balanceing.
You could be experiencing a slippage from the transfer-case as the clutch in there has to give or "slip" or drive-line binding could occur. most of the time this can be corrected just by servicing the transfer case and using the proper fluid and additive for the viscus clutches inside. The proper fluid is "autotrac fluid" from any g.m. dealer. its not cheap but must be used because of this condition. You could also be experiencing tire slipage because the clutch may not slip as it should. once again check and or service tha transfer case. To check the fluid you have to remove the "fill" plug on the rear of the transfer-case. This is the upper plug. Some are an allen hole requiring an allen wrench and some have a big hex bolt head aprox.1 1/4" in diameter. after removing the plug you should be able to feel the fluid on your finger if you stick it in there. autotrac fluid is clear in color and should not smell burn't. Good luck