The speaker is inside the case which contains the radio. Two screws at the bottom and nuts on the threaded shafts that hold the knobs. That should get the radio out. There may be another attachment point in there but I do not think so. Getting the speaker grill off the dash after the radio box is out will give you greater access to everything.


1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed