Is it 'Chunk' or 'Chuck'

Old Tired Rebel said

I have always called (Johnson Handle) a Jake brake which was taught to me when I started out as a truck driver

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Ah,ok now it makes sense.My pap and I were talking the other day about loosing your brakes while driving.He tells me he lost his once driving a brick truck and he said he had to grab the Johnson handle.Thanks for the clarification sir.