This page provides a detailed comparison of the specifications for the Allis Chalmers D21 Series I and the CaseIH Farmall 90.
| Allis Chalmers D21 Series I | CaseIH Farmall 90 | |
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | Turk Tractor |
| Engine Model | 3400 | FPT |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Naturally aspirated | Turbocharged and Intercooled |
| Engine Cylinders | 6 | 4 |
| Engine Displacement Value | 426 ci (7.0 L) | 274 ci (4.5 L) |
| Engine Rated Rpm | 2200 | 2300 |
| Engine Power Output Value | 103 hp (76.8 kW) | 84 hp (62.6 kW) |
| Transmission | ||
| Transmission Type | Sliding gear with dry disc clutch | 12-speed mechanical shuttle |
| Transmission Forward Gears | 8 | 12 |
| Transmission Reverse Gears | 2 | 12 |
| Dimensions | ||
| Length Value | 160.6 | - |
| Width Value | 91.6 | - |
| Operating Weight Value | 9500 lb (4309 kg) | 5702 lb (2586 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 2WD |
| Drive Type | 2WD | 2-Wheel Drive |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | III/II | - |
| Hitch Position | Rear | - |
| Hydraulic System Type | - | Open Center |
| Operator Station Type | Open | - |
| Starter Type | Electric | Electric Starter |
