I have an electric shift fourwheeler and every time I downshift my fourwheeler makes a grinding noise and it's coming from the transmission, could it be a gear?

Time to take clutch apart, could be throw out bearing, to transmission front bearing. fix it now before it is completely ruined

aparently not an uncommon problem. here is some read
https://www.justanswer.com/motorcycle/cb9d0-kawasaki-mule-2510-makes-grinding-noise.html

Bad linkage between shift lever and the transmission.

Could be time to replace battery, this is most likely the culprit. These fourwheelers are very picky when it comes to low power. Your starter is also most likely just fine, the clicking you hear is the solenoid on the starter, so your battery has some juice, but not enough amps to turn over the starter. Also If the fourwheeler has sat for a long time then you may just need to charge the battery. The 2007 is most likely fuel inject which uses even more fuel when running and it also has its own computer kind of like a PCM in a car or truck. These all need a good supply of power and the stator which is like an alternator usually needs the help of a fully charged battery to keep everything running properly. Also note, once you get a new battery or charge it in some cases the ATV should run smoother.

sounds like one of your solenoid in the valve body is bad, if you.are able to shift it.by yourself, then it could be a.solenoid, but also.check your transmission fluid to make sure its full, check when transmission fluid is hot, either in park or neutral, your owners manual will tell you which.way to check it, sometimes on the.dipstick it will say how to.check it to.

First you should wash it clearly and dry it in hot air then rub it by a dry clean cotton

check the main fuse

The belt and pulleys are probably not the cause with the sound you are describing. To me it sounds more mechanical when you say grinding. Have you checked the rear dif?