| Business | Phone |
| Aamco Transmissions 5870 Urbana Pike, Frederick 21704 | (301) 696-2222 |
| Bill & Earl's Auto Svc Ctr 414 N East St, Frederick 21701 | (301) 662-5941 |
| Discount Transmissions 900 E Patrick St # 4b, Frederick 21701 | (301) 698-9172 |
| Ken's Automotive Transmission 371 W Patrick St, Frederick 21701 | (301) 662-5100 |
| Quality Transmissions Svc 502a Highland St, Frederick 21701 | (301) 620-1090 |