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www.reference.com/vehicles/symptoms-bad-transfer-case-cc...

Symptoms of a bad transfer case manifest themselves differently depending on the extent of damage within this important drive-line component. According to AAMCO, the most obvious sign of transfer case failure is the complete loss of four-wheel or all-wheel drive.

www.700r4transmissionhq.com/symptoms-of-transfer-case-problems

One of the most common symptoms of transfer case problems is leaking fluid. The parts are packed into it so tightly that they have been known to wear a hole right through it. Clearly, without any fluid in there, the problem will go from bad to worse. Without lubrication, the parts in the transfer case will quickly burn up.

www.justanswer.com/chevy/7amq9-symptoms-malfuctioning...

What are the symptoms of a malfuctioning transfer case? IT is a 2000 1500 4wd suburban. I brought the truck in for ujoints because of the ditinctive crackeling of a spent ujoint but the mechanic says it is the transfer case. I do not detect a malfunction in the performance of the transmition.

www.yourmechanic.com/article/symptoms-of-a-bad-or-failing...

Over time the transfer case output shaft seal can fail, and when it does, will display a few symptoms that will alert the driver that a problem with this system exists. Noted below are a few of the common side effects of a damaged transfer case output shaft seal that should be replaced. 1. Difficulty shifting gears

itstillruns.com/transfer-case-troubleshooting-6525207.html

The combination of chains, transfer case, fluid and vacuum lines all can lead to problems. Tranmission Fluid. A transfer case is separate from the transmission case; the transfer case requires its own supply of transmission fluid. The fluid serves two purposes: to lubricate the chains and linkages, and to cool the fast-moving metal parts.

www.autoblog.com/2016/01/12/symptoms-of-a-bad-or-failing...

Symptoms of a Bad or Failing Transfer Case Output Shaft Seal ... The physical part of the vehicle that activates this action is the transfer case, which has an output shaft that delivers power to ...

www.holmanparts.com/.../10_TransferCaseDifferentialFailureMode_v2.pdf

No transfer case can be operated on the highway in four-wheel drive high or low without having problems. Those modes are for use on snow, grass, mud, sand or loose gravel – not on hard pavement – even in the rain. All transfer cases with 2 speeds have idling planets and will have some noise when unloaded.

www.scsgearbox.com/how-to-tell-if-you-need-a-new-transfer-case

Of course, a strange noise doesn’t always mean you need a new transfer case. Sometimes, especially in the winter, the noises may just indicate that your case needs additional lubrication. If you are concerned about your transfer case fluid, it is a good idea to check it on a regular basis.

www.dsmtuners.com/threads/bad-center-diff-or-transfer-case.306357

You would usually see gear oil all over the driveshaft tunnel above the transfer case if the yoke seal was leaking. Otherwise, look for wear or damage to the splines on the output shaft of the transmission that the transfer case attaches to, along with the splines on the Input shaft of the transfer case.

www.therangerstation.com/tech_library/transfercasetroubleshooting.htm

Transfer Case Difficult To Shift Into Desired Range. Transfer Case Noisy In All Gears. Transfer Case Noisy Or Jumps Out Of 4x4 Low Range. Lubricant Leaks From Vent Or Output Shaft Seals. Troubleshooting 1995 & Newer Electric Shift Transfer Cases. Diagnosing 1994 & Older Electric Shift Transfer Cases