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Old 03-14-2023, 12:41 PM   #1
wazzabie
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Optional factory horn?

I'm not sure if I'm reading this correctly. Was there an optional horn available?


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Old 03-14-2023, 01:11 PM   #2
JJH Jimmy
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Re: Optional factory horn?

Not sure about 73 - 80's but 81 - 87's Scottsdales and Silverados got a high note and a low note horns. Custom Deluxes just got the low note horn.
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Old 03-14-2023, 01:39 PM   #3
wazzabie
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Re: Optional factory horn?

Interesting. If I understand correctly the high note horn is more for animals and the low note horn is for humans. My 78 has two horns which I guess are both low note horns. I'm going to try and replace one of them with a high note horn.


https://www.usa1industries.com/1973-...c-truck-horns/
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Old 03-14-2023, 02:25 PM   #4
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Re: Optional factory horn?

If they are the factory horns, i believe that they should be stamped on them "Lo" or "Hi".
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2021 GMC 2500HD Duramax AT4

My "It's a Jimmy Thing" Build
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Old 03-14-2023, 05:59 PM   #5
Dead Parrot
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Re: Optional factory horn?

Another advantage of 2 or more horns of difference frequencies is you will also get a 3rd 'warble' note that is the interference frequency of the 2 horns. Not sure of the proper musical term. This 3rd note will have peaks with higher sound levels then either of the two base notes.

IIRC - Cadillac had 3 horns selected to create a special 'Cadillac' sound.
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Old 03-15-2023, 10:34 PM   #6
rick1956
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Re: Optional factory horn?

My 84 GMC had both the high and low pitch horns already. Even though both of them now sound perfect after I tweaked the tuning screws on them (to break the years of road grime loose), I still had to add my auxiliary Hutchins horn:

https://blogger.googleusercontent.co...Image00013.jpg
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