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Revision as of 09:38, 20 February 2011

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

Also see:

56-series Transmission, small and light

In the United States, Canada & Australia, all manual shift 1200s had the 4-speed transmission. The two competition four speeds [Option 1 & 2 four speeds in 56 series only] & the five speed was also sold by Datsun Competition in close-ratio and wide-ratio versions. In the five speed version, only the close ratio Option 1 gearbox was offered by Datsunsport Australia, not the standard five speed when I enquired in 1981.

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.

1 Powerflow Diagram
2 Maintainence Specifications
- 2.1 Lubricants
3 Ratios
4 Bellhousing Pattern
5 Weight Comparison
6 Part Numbers

Powerflow Diagram

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.

Maintainence Specifications

3-speed, 4-speed

Synchromesh type: Warner type. Synchromesh on all forward gears in both 3 & 4 speed models.
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

Lubricants

Use GL-4 80W-90 or 85W-140 multiweight, same as the differential lube.

Nissan recommendation
* API GL-4 
* MIL-L-2105

Such as:
* Chevron Multiservice Gear Lub. 75,80,90,140
* Esso Gear Oil GP 80,90,140
* Mobil Mobilube EP or GX 80-90,90,140
* Shell Spirax 75EP,80EP,90EP,140EP
* Sunoco Multipurpose Gear Lub. GL-4 80,90,140
* Texaco Universal Gear Lub. EP 80,90,140

1972 USA Owners manual (Page 23)

Recommended Lubricants

NOTE: Do not use GL-5 spec differential oil. Many people have reported problems with GL-5 gear lube in their older cars. The problem won't be immediately evident but over time the synchros will wear down. GL-5 is not automatically compatible with GL-4. Reportedly there are a few brands of GL-5 that do not use sulfur additives so if the container says GL-5 AND GL-4 then you may safely use it in the gearbox.

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
4-speed Option 1. floor shift [competition close ratio gearbox]
1st - 2.862
2nd - 1.908
3rd - 1.350
4th - 1.000
Rev - Not listed
Source. Datsun B110 Competition Tune Up Manual 1974
4-speed Option 2. floor shift [competition ultra close ratio gearbox]
1st - 2.169 [Note that first gear is the same ratio as the standard models second gear]
2nd - 1.593
3rd - 1.233
4th - 1.000
Rev - Not listed
Source. Datsun B110 Competition Tune Up Manual 1974
5-speed F5W56A floor shift
1st - 3.757
2nd - 2.374
3rd - 1.659
4th - 1.291
5th - 1.000
Rev - 4.040
5-speed F5C56A floor shift [Option 1 competition gearbox. Supersedes Option 1 & 2 four speed gearboxes]
1st - 2.676
2nd - 1.691
3rd - 1.398
4th - 1.182
5th - 1.000
Rev - Not listed
Source. Datsun B110 Competition Tune Up Manual 1974

Bellhousing Pattern

All A-series engines use the same bellhousing pattern. This means any rwd transmission, from B10 to B310, fits any A-series engine.

No other Nissan engine shares this pattern. This means transmissions from Datsun 1600 or any other will not fit an A-series engine.

B110 used a dust cover

B210 used a rear engine plate

Image to scale: 88dpi
Top to bottom: 338 mm
center hole: 94 mm
Blue holes: 8 mm
Red holes: 8 mm
Green holes: 9 mm
Gray holes: 10 mm

Weight Comparison

17.8kg (39.2 lbs): 56-series 4-speed (B110 edition)
24.8kg (54.6 lbs): 60A 5-speed (KPB310 edition)
31 kg: 63a gearbox complete with clutch set up (with no gearbox mount)
36.5kg: T50 with bellhousing and clutch set up
43.5kg (54.6 lbs): CA18DET 5-speed (rwd edition)

Part Numbers

30543-H1600 BOOT-RUBBER [clutch] $1.70
32862-G1200 BOOT-RUBBER CONTROL LEVER $3.20 [trans boot] formerly 32862-24900
74963-20900 BOOT-CONTROL LEVER [floor boot] $8.35

Rear Seal (includes cover shell)

32136-18001 SEAL-OIL REAR EXTENSION -0971
32136-H3100 SEAL-OIL REAR EXTENSION 1071-0972
32136-G1001 SEAL-OIL REAR EXTENSION 0973-0874
32136-G1001 SEAL-OIL REAR EXTENSION 0973- B120/B121/B122

32136-H5000 OIL SEAL-REAR EXTENSION 5-speed B310
32136-H5000 OIL SEAL-REAR EXTENSION -0779 B310
32136-H8900 OIL SEAL-REAR EXTENSION 0879- B310
- Not interchangeable with earlier

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Transmission Overview