The transfer case is found on vehicles with AWD or 4WD capability and is integral for allowing drivers to switch to these modes of operation.

A typical transfer case is found at the transmission's rear and powered by the transmission output shaft, operating like a secondary transmission unit.

What are the Symptoms of a Bad Transfer Case?
Transfer cases are supposed to last the vehicle's longevity. However, that doesn't always happen. Below, we look at some common signs you may find when you have a bad transfer case.

Shifting Issues
A common symptom of a bad transfer case is having trouble shifting between gear ranges. Although this issue could arise due to a low fluid level or damaged linkage, it typically indicates an internal transfer case failure.

Fluid Puddle Under the Transfer Case’s Location
There's only one reason why there would be a fluid puddle right under the transfer case area – and that's because there's a leak somewhere. Check that the leak is from the transfer case by inspecting it. You should easily see the leak at the rear of the transmission or transaxle assembly.

Strange Grinding, Growling or Humming Noises
Another sign there's a problem with your vehicle is the presence of unusual noises that weren't there before. Weird noises can be bothersome, almost always indicating that more significant issues are approaching.

If you hear grinding, growling, or humming noises that change with your vehicle speed, it may come from the transfer case. This could indicate a low fluid level or mechanical problems such as bad bearings, loose chains, or damaged gears.