This page provides a detailed comparison of the specifications for the Allis Chalmers D21 Series I and the Farmall 856.
| Allis Chalmers D21 Series I | Farmall 856 | |
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | International Harvester |
| Engine Model | 3400 | D-407 |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Naturally aspirated | Naturally aspirated |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 426 ci (7.0 L) | 407 ci (6.7 L) |
| Engine Rated Rpm | 2200 | 2400 |
| Engine Power Output Value | 103 hp (76.8 kW) | 95 hp (70.8 kW) |
| Transmission | ||
| Transmission Type | Sliding gear with dry disc clutch | Sliding gear with dry disc clutch |
| Transmission Forward Gears | 8 | 8 |
| Transmission Reverse Gears | 2 | 4 |
| Dimensions | ||
| Length Value | 160.6 | 163.8 |
| Width Value | 91.6 | 91.7 |
| Operating Weight Value | 9500 lb (4309 kg) | 10290 lb (4667 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | - |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | IH Fast Hitch |
| Hitch Category | III/II | II |
| Hitch Position | Rear | Rear |
| Operator Station Type | Open | Open |
| Starter Type | Electric | Electric |
