| Business | Phone |
| Productigear Inc 1900 W 34th St, Chicago 60608 | (773) 847-4505 |
| Keller Machine Co 315 N Leavitt St, Chicago 60612 | (312) 421-5285 |
| United States Gear Co 9420 S Stony Island Ave, Chicago 60617 | (773) 375-4900 |
| Sa Gear Inc 7252 W 66th St, Chicago 60638 | (708) 594-6845 |
| Roger's Manufacturing Inc 4211 W Diversey Ave, Chicago 60639 | (773) 486-7800 |
| North American Gear & Axle 1020 W 119th St, Chicago 60643 | (773) 821-5450 |