Chassis is pronounced SHAS-ee (IPA /ˈʃæsi/). The 'ch' is /ʃ/; silent final 's' — 'SHASS-ee'.
IPA: /ˈʃæsi/
Syllables: SHAS · ee
Common ESL mistake: Learners say 'CHASS-iss' pronouncing 'ch' as /tʃ/ and final 's'.
Tip: The 'ch' is /ʃ/; silent final 's' — 'SHASS-ee'.