difference between a pre and post 77 radio

[MR. T.]

I am wondering if anyone can tell me what changed in 77 that seems to indicate that a radio from a 76 and older would not work. Is this just with the factory items, or is this also true in the aftermarket? I can get one for a 76 that is a decent price, but not sure it would work. Thoughts?

 

[6880 Mike]

The 77 center gauge cluster and console were changed to allow generic GM stereos to fit the Corvette.

Stereos in the 68-76 models were two part with the final audio output being a separate unit due to space restrictions behind the dash. These units were Corvette specific and were not used in other GM makes.

For your '77, you want a '77 and later stereo.