Depends. Most likely cases: On a standard: Poor shifting on the driver's part. On an automatic: Transmission problems, get it checked.
Sounds like may be not enough oil, bad oil, torque converter porbs or may be bands in gearbox
The gears inside are stripped just disconnect the electrical plug on the side of the unit and leave it up.
A worn transmission gear can cause a Chevy Impala to whine when the gears change. A bad fan belt can also cause this.
Call the dealer, and ask for the different kinds of speedometer gears, you'll be lucky if you can still get one. They Usually go by color and teeth count. If I remember right, they are the typical cause.
Mechanical failure and lack of proper lubrication is what causes the banging of gears in VW Touareg.
My last two Buicks the automatic antennas stuck in the up position so I just pulled the electrical plug off the side of the antenna unit in the trunk and left them that way. They say the gears wore out and the only way to repair them is to replace them.
Park on level groundRun engine to normal operating temperaturePull and wipe dipstickRe-Install dipstickRun through gears (P-R-P-N-P-D-P-2-P-1-P)Pull and read dipstick DO NOT OVERFILL
infrequent oil changes, which cause the engine to build sludge. Also incorrect oil type
There can be several causes for the gears in a Mercedes A160 automatic gearbox to slip and not shift up to higher gears. One of the main causes is a leak in the intake. This could be a leak from a connection, or even a case of the intake bolts not tightened enough.
Shifting forks.They slide the gears along splines engaging them to another gear.
friction
Most commonly that would be the fly wheels within the transmission. It is advisable to see a mechanic for this problem to avoid a blown transmission.