| Thursday, April 9th, 1981 |
| Received MR Marcos Aranda from Major League Level Detroit. |
| Received MR Jorge Bocanegra from Major League Level Detroit. |
| Received MR Iván Morán from Major League Level Detroit. |
| Received C Woody Yates from Major League Level Detroit. |
| Received SS Earl Quick from Major League Level Detroit. |
| Received 1B Hsi-chuen Chu from Major League Level Detroit. |
| Received 3B Bruce Simmons from Major League Level Detroit. |
| Received LF Dennis Sullivan from Major League Level Detroit. |
| Received LF Carl Nicholson from Major League Level Detroit. |
| Received RF Freddie Shaw from Major League Level Detroit. |
| Received RF Sandy Pearson from Major League Level Detroit. |
| Received 1B Drew Moss from Major League Level Detroit. |
| Received 2B Henry Olson from Major League Level Detroit. |
| Received 2B Fernando Hernández from Major League Level Detroit. |
| Demoted SP Doug Johnston to Double A San Antonio. |
| Demoted MR Don Lehman to Double A San Antonio. |
| Demoted MR Axel Jamieson to Double A San Antonio. |
| Demoted MR Steve Davis to Double A San Antonio. |
| Demoted C Alfonso Torres to Double A San Antonio. |
| Demoted 1B Brandon MacMurdo to Double A San Antonio. |
| Demoted 2B Bill Cook to Double A San Antonio. |
| Demoted RF Lee Sheehan to Double A San Antonio. |
| Demoted 1B Luis Francisco to Double A San Antonio. |
| Demoted 1B Jack Shannon to Double A San Antonio. |
| Demoted 1B Júlio Echevarría to Double A San Antonio. |
| Demoted RF Juan Reyes to Double A San Antonio. |
| Demoted SS Robby Wright to Double A San Antonio. |
