Ford 6640 Transmission


Ford 6640 tractor photo
1991 - 1995
PowerStar 40 Series
Utility tractor
6610
Series:564066407740
6640
Transmissions overview
8-speed constant mesh
16-speed two-speed power shift
12-speed synchronized
16-speed four-speed power shift
Transmission
Transmission:EconoShift
Type:constant mesh
Gears:8 forward and 2 reverse
Clutch:dry disc
Oil capacity:69.6 qts
65.9 L
Four gears (1-4), plus reverse, in two ranges (L/H). Optional creeper provided a third range. Tractor must be stopped and clutch used to shift gears or range. The eight-speed transmission was only used on the 6640S.
Speeds
With 16.9-34 rear tires.
6640 EconoShift constant mesh speeds
Transmission
Transmission:Dual Power
Type:two-speed power shift
Gears:16 forward and 4 reverse
Clutch:dry disc
Oil capacity:69.6 qts
65.9 L
Dual Power adds a two-speed power shift between direct drive and the lower Dual Power range to the basic eight-speed transmission. The Dual Power range is engaged by a switch on the dashboard. Dual Power was an option on the 6640S.
Speeds
With 16.9-34 rear tires.
6640 Dual Power two-speed power shift speeds
Transmission
Transmission:SynchroShift
Type:synchronized
Gears:12 forward and reverse
Clutch:dry disc
Four gears (1-4) in three ranges (L/M/H) with right-hand shuttle lever. Gear shifts are synchronized. Shifts between medium and high ranges are synchronized, but the tractor should be stopped to shift to or from low range. Synchronized shuttle shifting. The 12-speed SynchroShift was standard on the 6640 SL. Dual power was an option with the SynchroShift, turning it into a 24-speed transmission.
Speeds
With 16.9-38 rear tires.
6640 SynchroShift synchronized speeds
Transmission
Transmission:ElectroShift/Pulse Command
Type:four-speed power shift
Gears:16 forward and reverse
Clutch:wet disc
Oil capacity:64 qts
60.6 L
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.
Speeds
With 16.9-38 rear tires.
6640 ElectroShift/Pulse Command four-speed power shift speeds
Page information
Last update:April 23, 2022
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