| Business | Phone |
| Acme Diesel 4724 Rutledge Pike, Knoxville 37914 | (865) 524-3005 |
| City Diesel Inc 113 Dante Rd, Knoxville 37918 | (865) 687-6389 |
| Continental Engines Knoxville 37918 | (865) 922-5632 |
| Covington Detroit Diesel 1500 Breda Dr, Knoxville 37918 | (865) 689-3722 |
| Cummins Cumberland Inc 1211 Ault Rd, Knoxville 37914 | (865) 523-0446 |
| Diesel Head & Engine Parts 207 Center Park Dr, Knoxville 37922 | (865) 966-0541 |
| John Story Truck & Equip Co 8009 Rutledge Pike, Knoxville 37924 | (865) 525-9899 |