It could be as simple as a slight imperfection in one of the gears or it could be an indication that the drive shaft or "half shaft" is worn.
truck will only go forward not in reverse does this mean the transmission is gone
There may be something wrong with the transmission or the linkage.
It may mean your transmission is damaged, and is applying too much torque. You may have lost fluid through a crack in the transmission. A qualified transmission mechanic can determine if the transmission needs to be repaired or replaced.
If you mean the transmission itself shifts forward, it is because the transmission is suspended, so when the transmission is put in reverse gear the momentum will push the transmission forward. Now, if the car pulls forward when put in reverse, this means there is a transmission problem. This may just indicate the shift linkages need adjustment, or that the transmission has a major problem and needs repairing. Take it to a shop and have it checked.
A car that won't move when in reverse could indicate a problem with the transmission. It could also indicate a problem in the gear selector.
Do you mean the shifter or car physically does not move? BClear.
A Chevy 305 is not a transmission it is a motor. If you mean a Chevy turbo 350 then the answer would be 3 different forward speeds and reverse.
automatic transmission solenoid switch latched in low/reverse position
If you mean automatic transmission there are several different types with complex nature. But for a manual transmission the main components are: 1-Shafts 2-Clutch 3-Synchromesh 4-Gears (1,2,3,4,5,...,Reverse)
Solenoid switch valve latched in the low/reverse position. On a 300M it is usually a failed transmission solenoid pack.Solenoid switch valve latched in the low/reverse position. On a 300M it is usually a failed transmission solenoid pack.
This is a manual transmission car, I presume. If it's an auto, you have a big problem! Grinding could mean that something inside the transmission is failing. Or it could mean that your transmission fluid is low. OR, it could mean that your clutch is worn or is out of adjustment. Grinding usually means that the clutch is not disengaging properly when you push the clutch pedal, or perhaps, a synchronizer has failed. Whatever the case, If I were you, I'd get the car to my mechanic and have her looked at.
That you need a transmission shop. It is possible but unlikely that your linkage needs adjustment; more likely is that you need a new transmission.