First flight on August 1970, the S-58T is an old airframe converted to turboshaft power using different versions of the Pratt & Whitney Canada PT6T engine. Kits built by Sikorsky by at least 160 conversions carried out by different companies.
Operators
| 1956-1976 |  Armée de l'Air S-58 H-34 |
| 1957-1972 |  Heeresflieger S-58 H-34 |
| 1962-2003 |  Royal Thai Air Force S-58 H-34 |
| 1965-1975 |  Air America S-58 H-34 |
| 1973-?? |  Líder Aviação |
| 1974-1981 |  British Airways Helicopters S-58 H-34 |
| 1975-1980 |  Fuerza Aerea Argentina S-58 H-34 |
| S-58 H-34 | |
 Okanagan Helicopters S-58 H-34 |
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| Carson Helicopters S-58 H-34 |