This page provides a detailed comparison of the specifications for the Allis Chalmers 7000 and the Twin City Unknown.
| Allis Chalmers 7000 | Twin City Unknown | |
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| Engine | ||
| Engine Manufacturer | Allis Chalmers | Twin City |
| Engine Model | 2900 | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Kerosene |
| Engine Induction Type | Turbocharged | Naturally aspirated |
| Engine Cylinders | 6 | 4 |
| Engine Displacement Value | 301 ci (4.9 L) | 340 ci (5.6 L) |
| Engine Rated Rpm | 2200 | 1000 |
| Engine Power Output Value | 117 hp (87.2 kW) | - |
| Transmission | ||
| Transmission Type | Partial power shift | Gear |
| Transmission Forward Gears | 12 | 2 |
| Transmission Reverse Gears | 3 | 1 |
| Dimensions | ||
| Length Value | 183 | 134 |
| Width Value | - | 63 |
| Operating Weight Value | 9550 lb (4332 kg) | 5000 lb (2268 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | - |
| Drive Type | 2WD | - |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | II | Category 3 |
| Hitch Position | Rear | - |
| Hydraulic System Type | Open center | - |
| Operator Station Type | Cab (Acousta-Cab optional or Acousta-Cab II from 1978) | - |
| Starter Type | Electric Starter | Hand-crank |
