I highly doubt it has anything to do with your radio install.
The linkage is a rod linkage on your car, so there is no cable. If your linkage came undone, you would have little to no resistance moving the shifter all around.
Sounds like you might have a busted motor mount, based on your description.
The linkage is a rod linkage on your car, so there is no cable. If your linkage came undone, you would have little to no resistance moving the shifter all around.
Sounds like you might have a busted motor mount, based on your description.