| Business | Phone |
| National Transmission Ctr 1801 Kinney Fort Trl B, Round Rock 78664 | (512) 246-6663 |
| A B & T Transmission 710 S I H 35, Round Rock 78681 | (512) 388-2216 |
| Aamco Transmissions 1902 Kinney Fort Trl, Round Rock 78664 | (512) 244-2080 |
| Cottman Transmission Centers 1405 N I H 35, Round Rock 78664 | (512) 388-3388 |
| Cottman Transmission Centers 4900 N I H 35, Round Rock 78681 | (512) 420-0492 |