Chevrolet never installed a Klaxon (OOGHA) horn from the factory to my knowledge, the horn you see mounted on the intake is as you mentioned a Delco-Remy vibrating horn.

What year truck are you talking about?

Mike B smile

Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD