4 x 400 m Relay, Men
| Competition | 1945 South American Athletics Championships |
|---|---|
| Venue |
Montevideo
 URU
|
| Held | — |
| Status | Medal |
| Competitors | 12 |
| Countries | 3 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Brazil |  BRA |
3:16.5 | ||
| Rosalvo Ramos | — | ||||
| José de Assis | — | ||||
| Agenor Da Silva | — | ||||
| Mário Carvalho Pini | — | ||||
| 🥈 | Argentina |  ARG |
3:20.0 | ||
| Antonio Pocoví | — | ||||
| Adelio Márquez | — | ||||
| Leopoldo Monastirsky | — | ||||
| Agustín Martín | — | ||||
| 🥉 | Uruguay | URU |
3:28.7 | ||
| Manuel Leal | — | ||||
| César Raimundo | — | ||||
| Homero Camé | — | ||||
| Nelson García | — |