Compare/Ford 6640 vs Ford 8401

Ford 6640 vs Ford 8401

Verdict: Ford 6640 vs Ford 8401

The Ford 6640 and the Ford 8401 are both tractors — here is how they stack up on the figures that matter. Ford 8401 leads on rated power with 94 hp against 91 hp. Ford 8401 is the lighter machine (4,750 kg vs 7,099 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Ford 6640 is the newer design (1991 vs 1980). In short: choose the Ford 8401 for outright pulling power, or the Ford 6640 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Ford

Fit score

Best match

Clear

Ford

Fit score

Best match

Clear

Rated power

91 hp

94 hp

Confidence

40%

Guide price

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Overview

Manufacturer

FordReference

Four power shift gears arranged in two synchronized ratio groups (1-4 and 5-8). Two synchronized ranges (low/high) and right-hand shuttle. Clutch must be used to shift range or move between the lower (1-4) and higher (5-8) gear ratio groups. Push-button power shifting between the four gears in a ratio group. Push-button de-clutching on the shuttle lever allow shifting without the foot clutch. The 16 power shift was standard on the 6640 SLE.Reference

liquid-cooledReference

Drive

4x4 MFWD 4WD (optional)Reference

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Final drives

inboard planetaryReference

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Differential lock

electro-hydraulic (SL/SLE)Reference

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Brakes

hydraulic wet disc (SL/SLE)Reference

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Total built

—

720Reference

Variants

6640S

8-speed economyReference

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6640SL

12-speedReference

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6640SLE

16-speed premiumReference

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Engine

Fuel tank

177.5 LReference

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Engine (gross)

67.6 kWReference

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Engine (net)

63.4 kWReference

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Drawbar (tested)

50.1 kWReference

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Displacement

5.0 LReference

6.6 LReference

Bore/Stroke

112 x 127 mmReference

112 x 112 mmReference

Power (net)

63.4 kWReference

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Power (gross)

67.6 kWReference

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Air cleaner

dual paper elementsReference

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Compression

17.5:1Reference

16.3:1Reference

Rated RPM

2200Reference

2440Reference

Idle RPM

725-2375Reference

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Torque

457.0 NmReference

367.5 NmReference

Torque RPM

1200Reference

1500Reference

Firing order

1-3-4-2Reference

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Starter volts

12Reference

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Coolant capacity

16.0 LReference

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Intake valve clearance

0.406 mmReference

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Exhaust valve clearance

0.483 mmReference

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Oil capacity

60.6 LReference

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Max power

50.1 kWReference

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Power at rated engine speed

57.2 kWReference

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Engine

—

81.5 kWReference

Drawbar (claimed)

—

62.8 kWReference

Power

—

81.5 kWReference

Transmission

ElectroShift/Pulse CommandReference

Dual PowerReference

Gears

16 forward and reverseReference

16 forward and 4 reverseReference

Clutch

wet discReference

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PTO & Hydraulics

PTO (claimed)

56.7 kWReference

70.1 kWReference

PTO (tested)

57.5 kWReference

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Type

four-speed power shiftReference

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Valves

1 to 4Reference

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Pump flow

79.5 lpmReference

34.1 lpmReference

Steering press.

144.8 barReference

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Rear Type

IIReference

Control

Position control and top-link draft sensing. Electronic lower-link sensing optional on 6640 SLE.Reference

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Rear lift (at 24"/610mm)

2977 kgReference

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Rear PTO

independentReference

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Rear PTO Type

540/1000Reference

540 (1.375)Reference

Power at rated PTO speed

56.4 kWReference

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Hydraulic system

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53.0 LReference

Capacity

—

53.0 LReference

Engine RPM

—

540@2300Reference

Dimensions

Wheelbase

236 cmReference

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Weight

7099 to 9121 poundsReference

4750 kgReference

Front tire

7.50-16Reference

10.00x16Reference

Rear tire

16.9-30Reference

23.1x30Reference

Ag front

7.50-16Reference

10.00x16Reference

Ag rear

16.9-30Reference

23.1x30Reference

Length

411 cmReference

419 cmReference

2WD Width

195 cmReference

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4WD Width

203 cmReference

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2WD Clearance (front axle)

55 cmReference

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4WD Clearance (front axle)

50 cmReference

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2WD ROPS Shipping

3220 kgReference

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4WD ROPS Shipping

3670 kgReference

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2WD Cab Shipping

3687 kgReference

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4WD Cab Shipping

4137 kgReference

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Operating

3690 kgReference

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Ballasted

4702 kgReference

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Height (exhaust)

—

228 cmReference

Ground clearance

—

48 cmReference

Ford 6640 attachments

6640 Serial Numbers

1991

BC68791Reference

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1992

BD02865Reference

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1993

BD35935Reference

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1994

BD65544Reference

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1995

BD98440Reference

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1996

021630BReference

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1997

056502BReference

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1998

083503BReference

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Location:

Data plate inside hood.Reference

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Electrical

Ground

negativeReference

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Charging system

alternatorReference

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ROPS Charging amps

55Reference

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Cab Charging amps

100Reference

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ROPS Batteries

1Reference

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Cab Batteries

2Reference

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Battery CCA

800Reference

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Battery volts

12Reference

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Attachment overview

Ford 6640 Height

Hood

170 cmReference

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Cab

271 cmReference

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Exhaust

284 cmReference

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Test results

Fuel use

17.0 l/hourReference

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Max pull

4768 kgReference

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Speeds

Capacities

Fuel

—

196.8 LReference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.