McCabe was educated at Falmouth Grammar School; the University of Nottingham; St Catherine’s College, Oxford; and Wycliffe Hall, Oxford. He was ordained in 1959. After curacies in Compton Gifford and Exeter he held incumbencies in Capel, Surrey and the Scilly Isles. He was also a Chaplain in the RNR from 1963 to 1983 and a Canon Residentiary at Bristol Cathedral from 1981 to 1983. After that he was at Manaccan with Helston until his appointment as Archdeacon.
- Church news. The Times (London, England), Tuesday, April 09, 1996; pg. 16; Issue 65549
- "John Trevor McCabe". Crockford's Clerical Directory (online ed.). Church House Publishing. Retrieved 6 July 2017.
- Crockford's Clerical Directory 1987-88 p 353 London, Church House Publishing, 1987 ISBN 0715180665
- ‘McCABE, Ven. (John) Trevor’, Who's Who 2017, A & C Black, an imprint of Bloomsbury Publishing plc, 2017; online edn, Oxford University Press, 2016 ; online edn, Nov 2016 accessed 6 July 2017
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