[Warren Seale]

Originally Posted by 78w72

I dont know for sure what the UPC UP8 means for 78 but the chart I showed is pretty clear its for dual rear speakers in 1978. maybe the UP8 RAD PROVI STE means provisions for stereo radios which would be dual rear speakers &/or the wiring for a stereo radio? If there wasnt dual rear speakers in 78, how did they do the stereo left/right separation for stereo radios that were available, left to the rear speaker & right to the front? Doesnt make much sense to do that with a stereo signal IMO.

There is only a left/right balance adjustment on the radio, but in these cars, this meant front to back.

If there are two rear speakers then the front and one rear speaker was the left channel and the other rear speaker is the right channel.

Maybe the two rear speakers were just being phased in during the 78 production? But as an original owner, I'm pretty sure 79 was when the two rear speakers began.