| Specifications | GMD 55 | GMD 66 |
| Working width (feet) | 6'7" / 2.00
| 7'10" / 2.40 |
| Number of discs with protecting skids | 5 | 6 |
| Transport width (feet) | Tractor width + approx. 10" / 25 cm
| Tractor width + approx. 10" / 25 cm |
| Average swath width (feet) | 4'7" / 1.40 | 5'11" / 1.80 |
| PTO speed (rpm) | 540 | 540 |
| Weight (lb) | 891 / 405 | 995 / 452 |
| Minimum power requirement for PTO (kW) | 25 | 31 |
| Minimum power requirement for PTO (hp) | 35 | 42 |
| Tractor hydraulic equipment | 1 single acting valve | 1 single acting valve |