I don't know for sure on a Chevy but most modern vehicles have 2 sets of O2 sensors, before the cats and behind. The only thing the ones behind do is verify that the catalytic converters are working.
People connect resistors of a certain value across the wires to those rear sensors to fool the computer into thinking the cats are still working all the time and remove them. Search for "MIL eliminators" I would be shocked if you can't them for your truck.
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Today's Featured Article - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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