11 material differences · fewer than 12
Tractor oneInternational Harvester D-4391962–1966No measured PTO figureTractor twoNuffield M-31948–1954No measured PTO figure
Which should you choose?
Read our verdict on the D-439 and the M-3 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
11 material differences · 2 fields identical or within 5%, which is not counted as material
| Field | D-439 | M-3 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 38.5 hp | 38.0 hp | — |
| Engine declared | INTERNATIONAL-HARVESTER DD-148 | MORRIS-COMMERCIAL 38 T/V/T | differs |
| Displacement declared | 2.43 L | 3.77 L | +55% M-3 |
| Maximum torque declared | 98 lb·ft · 133 N·m | 138 lb·ft · 187 N·m | +41% M-3 |
| Transmission | |||
| Top speed declared | 12.4 mph · 20 km/h | 17.4 mph · 28 km/h | +40% M-3 |
| Clutch declared | Pedal operated dry single plate clutch from Fichtel & Sachs | — | — |
| Hydraulics & hitch | |||
| Pump flow declared | 6.3 gpm · 24.0 L/min | 7.2 gpm · 27.3 L/min | +14% M-3 |
| Pressure declared | 2,119 psi · 146 bar | — | — |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 3,876 lb · 1,758 kg | 4,848 lb · 2,199 kg | +25% M-3 |
| Wheelbase declared | 74.0 in · 1,880 mm | 83.0 in · 2,108 mm | +12% M-3 |
| Length declared | 115.4 in · 2,930 mm | 126.0 in · 3,200 mm | +9% M-3 |
| Width declared | 64.6 in · 1,640 mm | 80.0 in · 2,032 mm | +24% M-3 |
| Ground clearance declared | 15.0 in · 380 mm | 23.0 in · 584 mm | +54% M-3 |
| Turning radius, braked declared | 8.9 ft · 2.70 m | — | — |
| Fuel tank declared | 58.1 qt · 55.0 L | 76.8 qt · 72.7 L | +32% M-3 |
Height is not in this table. It is not one measurement: the sources measure it to different points — over the cab on some machines, over the steering wheel or the exhaust on others — and the same tractor measured two ways can differ by most of a metre. It appears here only when both machines' figures carry the point they were measured to and it is the same point, which is not the case for these two. Each machine's own page prints its height as its source gives it.
International Harvester D-439 sources
Source
- Source: Traktorenlexikon, “McCormick D-439”
- Source: Traktorenlexikon, “McCormick D-436 Standard”
Nuffield M-3 sources
Source
- Source: Traktorenlexikon, “Nuffield Universal M 3 (1948-1957)”
- Source: Traktorenlexikon, “Nuffield Universal M 4 / TVO (1948-1954”