1977 K20 audio

1975 K20 · Mar 16, 2026

I have a 1977 K20 in need of audio. I have the corner brackets with 6x9 pioneer speakers. What is the best radio for this truck? (preferably with bluetooth) What is the best dash speaker setup? Thanks!

mtbadbob · Mar 16, 2026

I'm assuming your dash isn't butchered and you still have the two knob radio hole in it? If you're wanting bluetooth, there are several aftermarket companies that make them to fit the 2 knob holes. If you want old school, try to find yourself an old Pioneer am/fm cassette Super Tuner III deck. There are also plenty of speaker kits that'll fit the dash.

Sad Sack · Mar 16, 2026

^^^^ What he said, two-hole for knobs or cut out for newer style single DIN radio? ^^^^ Then others will chime in with more options.

But for dash speakers, I used these, Kenwood KFC-835C because of price, brand, specs and their mounting depth didn’t interfere with my dash pad. Screwed down on top like factory ones if your is equipped with 3.5" corner dash speakers, 2 screws each.

1975 K20 · Mar 19, 2026

Thanks for the info! No my dash is not butchered. I just recently took out the old AM radio because it quit. Mine has the speaker in the center of the dash. Can you convert them to corner? If so what size can you fit in there? I have a set of 4x6 speakers. Thanks!

Old Guy Bill · Mar 19, 2026

The RetroSound has worked well for me. It's certainly not audiophile quality..
but connects quickly and has plenty of volume.
I put the two small 3-4" speakers in the center along with the cab corner 6x9s

RetroSound® Radio's for Classic Cars and Trucks

RetroSound® radios are the most advanced car stereos available for classic car and trucks. Designed to look just like the original factory radio but sound like a modern car stereo. RetroSound offers period-correct and authentic replica radios for classic Chevy, Ford, Mopar, Mercedes, BMW...

www.retromanufacturing.com

1975 K20 · Mar 19, 2026

Nice truck! Is retro radio the radio brand?

Jrgunn5150 · Mar 19, 2026

For me, any more, 2 Turtle Boxes and my phone.

1975 K20 · Mar 19, 2026

Are they louder than any system you can put together for that price?

Jrgunn5150 · Mar 19, 2026

Mega loud, good sound too, no dash messing up, no wiring, USB C and pair them together

1975 K20 · Mar 19, 2026

What model?

Jrgunn5150 · Mar 19, 2026

All of mine are Gen 3, I think they've been replaced by the Gen 4 now.

75gmck25 · Mar 20, 2026

The brand is Retrosound, and there are several models. I used one of their radios, a stereo center dash speaker (not much separation of left and right), and added 6x9s in the door. In hindsight, I should have just used the brackets and cab corner speakers instead of butchering the doors.

1975 K20 · Mar 20, 2026

Thanks!

molus · Mar 23, 2026

You can get these lower kicker panels from eBay pretty cheap. Tuning 3 1/2 kicker speaker. Sounds many times better than the centre speaker. I’m also running 6/9 in back with an under seat sub.

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1975 K20 · Mar 24, 2026

Thanks! Do you remember how much they were?

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