All Datsun 1200s were fitted with a 3-speed, 4-speed or 5-speed 56-Series_Transmission. Other transmissions that will fit the Datsun 1200's engine include the 60-Series Transmission and the 63-Series 5-speed transmission.
* B10 (Datsun 1000): 56-series * B110 (Datsun 1200): 56-series * B210 A12 engine (120Y): 56-series * B210 A14 engine 4-speed: 60-series * B210 A14 engine 5-speed: 63-series * B310 A12 engine (Sunny/210/120Y): 56-series * B310 A14/A15 engine (Sunny/210/140Y,150Y): 60-series
Look for the large letters on the right side of the case.
After determining the series, see the following pages to identify 4-speeds from 5-speeds:
The 56-series transmissions are identified by their small size and extensive ribbing. The 60-series transmissions are a little bit bigger but have a smooth case. Finally, the 63-series transmissions are much bigger units.