Exactly what it sounds like. Cars have different gears to chose from depending on how you want to drive. Low gears are strong but slow, good for getting started, going uphill, or just going slow. High gears are fast but weaker, good for going faster.
rpm too low maybe you are shifting to soon
When the shifting linkage is disconnected the car will appear to go into gear but not move. The car will not move when the transmission fluid is low.
best case senario, low trans fluid. worse case senario bad transmission.
The car is attempting to find the next gear, stopping the car while finding it, and then moving on.
The car isn't necessarily shifting into neutral its just staying in a lower gear and not shifting to the next gear, check your transmission fluid.
A broken shifting fork in the transfer case will cause your vehicle to stay in the gear that it was in when the shifting fork broke. Broken shifting linkage can also cause the problem.
its not if you have overdrive its shifting into it it feels like its down shifting but it really isnt.
Gear shifting has little to do with batteries, or your car's electrical system. If your car is stuck in one gear, your clutch (on a manual) or even worse, your transmission, might be going out. The dead battery might be just a coincidence.
Transmission. If an Automatic trans and car sounds like it is always in '1st' gear (engine rpm very high, has a lot of torque when you press or release the gas pedal) the shift cable has the trans in 1st or low gear, or there is a problem within the transmission preventing it from shifting (low fluid level, bad solenoid on or in the trans, bad shifter assembly)
Its normal for most manual cars the clutch is basically shifting gears in the engine but if you are accelrating shifting gears higher it could jerk a little bit so it can lock the gear and preset the engine to the desired gear Now if this is an automatic here you are not hitting the brake pedal fully Transmission fluid is low or empty Or it can be just old so it can jerk a bit to get into gear... however it is potentially bad for an automatic car because it has more parts and the thing it would do the most harm to is the gearbox.