During shifting into a reverse gear a grinding sound is heard coming from the transmission.
When shifting into gear the transmission is disconnected from the engine upon stepping on the clutch pedal. The same with shifting into reverse gear. Now, during shifting if the clutch is not fully release when the clutch pedal is depress the gears inside the transmission will clash this clashing of gears produce grinding sound. However, not all grinding sound that is heard during shifting is because of nit fully depress clutch pedal, there may be other cause of grinding sound that because of the complexity of transmission it can only be determined through a thorough inspection by a qualified professionals.
Possible Cause of Grinding Sound when Reversing
For the mean time in the absence of actual transmission inspection we can say that the only possible cause of the problem is that the clutch not fully releasing.
How to fix grinding sound when shifting in reverse
We recommend to bring your car to a reputable auto repair shop specializes of transmission repair. Ask the mechanic to look into the clutch linkage, usually this might be just a simple adjustment to correct the problem on not fully releasing clutch, if the mechanic suggested to pull down the transmission, do not agree seek first a second opinion from a different auto repair shop, if another repair shop told you that it is necessary to pull down the transmission then have it pull down.