This page provides a detailed comparison of the specifications for the Allis Chalmers D21 Series I and the John Deere 7700.
| Allis Chalmers D21 Series I | John Deere 7700 | |
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | John Deere |
| Engine Model | 3400 | John Deere |
| Engine Cooling Type | Liquid-cooled | Liquid |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Naturally aspirated | Turbocharged |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 426 ci (7.0 L) | 466 ci (7.6 L) |
| Engine Rated Rpm | 2200 | 2100 |
| Engine Power Output Value | 103 hp (76.8 kW) | 150 hp (111.9 kW) |
| Transmission | ||
| Transmission Type | Sliding gear with dry disc clutch | Partial Power Shift |
| Transmission Forward Gears | 8 | 16 |
| Transmission Reverse Gears | 2 | 12 |
| Dimensions | ||
| Length Value | 160.6 | 187.2 |
| Width Value | 91.6 | - |
| Operating Weight Value | 9500 lb (4309 kg) | 13870 lb (6291 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 2WD |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | Three-point hitch |
| Hitch Category | III/II | IIIN/II |
| Hitch Position | Rear | - |
| Hitch Capacity Value | - | 8930 lb (4051 kg) |
| Hydraulic System Type | - | Open center |
| Operator Station Type | Open | ComfortGard cab (standard) with air-conditioning |
| Starter Type | Electric | Electric |
