![[Datsun 1200 encyclopedia]](/wiki/upload/wiki.png)
| Revision as of 02:08, 25 June 2007 Ddgonzal (Talk | contribs) (->Specifications) <- Previous diff |
Revision as of 05:00, 25 June 2007 Ddgonzal (Talk | contribs) Next diff -> |
||
| Line 10: | Line 10: | ||
| The standard 4-speed was well suited to the A12 [[Engine]]'s torque curve. With a steep 3.757 first gear and a medium-steep 3.90 rear [[Differential]] pushing small-diameter 12" [[Tires]], it gave the little 1200 engine enough torque multiplication to take off easily, even with no throttle input. Yet top (4th) gear was good for 90mph. The 5-speed improved upon this by adding an extra gear between 1st and Top. | The standard 4-speed was well suited to the A12 [[Engine]]'s torque curve. With a steep 3.757 first gear and a medium-steep 3.90 rear [[Differential]] pushing small-diameter 12" [[Tires]], it gave the little 1200 engine enough torque multiplication to take off easily, even with no throttle input. Yet top (4th) gear was good for 90mph. The 5-speed improved upon this by adding an extra gear between 1st and Top. | ||
| + | |||
| + | |||
| + | = Powerflow Diagram = | ||
| + | http://datsun1200.com/modules/myalbum/photos/thumbs/13278.jpg | ||
| + | [http://datsun1200.com/modules/myalbum/photo.php?lid=13278 F4W56 gear train] | ||
| + | |||
| + | The countershaft always rotates with the input shaft. The output shaft (mainshaft) does not move when in neutral -- the main gears just spin freely. When the shifter is moved, it pushes one of the synchro collars against a gear, locking it to the mainshaft. Reverse is a special case, it pushes an ''idler'' gear between the counter and main gears, reversing rotation of the mainshaft. | ||
Revision as of 05:00, 25 June 2007
All Datsun 1200s were fitted with a 56-Series_Transmission. Most Datsun 1200s come with a 4-speed floor shift manual transmission (FS4W56). Some Standard models had a 3-speed column shift (R3W56). In Japan, the special GX-5 model came with a direct-fifth (non-overdrive) 5-speed (F5W56).
Main article: 56-Series Transmission
In the United States and Canada, all 1200s had the 4-speed transmission. The 5-speed was also sold by Datsun Competition in close-ratio and wide-ratio versions.
Note that the 4-speed transmission was redesigned in April 1973. Gearsets are not interchangable between early and late transmissions.
The standard 4-speed was well suited to the A12 Engine's torque curve. With a steep 3.757 first gear and a medium-steep 3.90 rear Differential pushing small-diameter 12" Tires, it gave the little 1200 engine enough torque multiplication to take off easily, even with no throttle input. Yet top (4th) gear was good for 90mph. The 5-speed improved upon this by adding an extra gear between 1st and Top.
Powerflow Diagram
The countershaft always rotates with the input shaft. The output shaft (mainshaft) does not move when in neutral -- the main gears just spin freely. When the shifter is moved, it pushes one of the synchro collars against a gear, locking it to the mainshaft. Reverse is a special case, it pushes an idler gear between the counter and main gears, reversing rotation of the mainshaft.
Maintainence Specifications
3-speed, 4-speed
- Synchromesh type: Warner type. No syncho on 1st or Rev
- Oil capacity: 1.2 liter (2.5 US pint, 2.125 Imperial pint)
- Oil type:
- Oil Drain plug & Filler plug torque: 4.0 - 6.0 kg-m (29-43 ft-lb)
- Speedometer gear ratio:
- 17/5
- 18/5 for Wagon
Ratios
- 3-speed R3W56L steering column shift
- 1st - 3.380
- 2nd - 1.734
- 3rd - 1.000
- Rev - 3.640
- 4-speed F4W56L floor shift
- 1st - 3.757
- 2nd - 2.169
- 3rd - 1.404
- 4th - 1.000
- Rev - 3.640
- 5-speed F5W56A floor shift
- 1st - 3.757
- 2nd - 2.374
- 3rd - 1.659
- 4th - 1.291
- 5th - 1.000
- Rev - 4.040