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[Datsun 1200 encyclopedia]

Automatic transmission conversion

From Datsun 1200 Club

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Categories: Automatic Transmission | Transmission

Gearbox Swaps
 Types: 56 | 60 | 63 | 71 | 90 | R30 
 Transmission Swaps
 5-Speeds | F5C56A | Stumpy
 Toyota 5-speed
 Manual/Auto conversion
 more: Transmission Modifications

Automatic-equipped 1200s had a significantly larger front tunnel area. The rear of the tunnel is the same. For this reason you can easily convert an Auto car to a Manual car. To go to an automatic you may need to modify the tunnel.

Also see: Manual transmission conversion



Here's all the parts you need to gather to fit an Automatic in a car that currently has a manual transmission:



* Tunnel from B110 automatic, B210 (any) or 610
* Automatic with Torque Converter
* Automatic Driveshaft
* Automatic Shifter with linkage and the automatic console
* Rear rubber insulator for Automatic

Speedometer Cable

The speedo cable is the same as a manual transmission.


Shifter came with a console.


The automatic has a larger spline. So use the auto driveshaft with auto transmission. Remember that B110 and B210 Driveshaft is the same. The B210 and B110 driveshafts are the same length. Only automatic vs manual lengths are different.

The spline is the same as what the larger Datsuns used.

Rear Engine Mount

The rear engine mount, also called the "transmission crossmember" is mounted about six inches further back.

See Gearbox Mount

or you could make your own
17481.jpg 17482.jpg 17483.jpg

Gearbox mounts are different, but is the shifter hole in the tunnel is in the same place (the rear portion of the tunnel is the same).

Engine Differences


For emission controls, the carb differed. However you can use any carb with an automatic.


Auto cars had a different distributor curve for emission control. However you can use any distributor with an automatic.

Flex Plate

Automatics don't use a flywheel, the torque convertor has enough mass to act as the flywheel. They use a thin "flex plate" with has the ring gear teeth for the starter.

th_5329.jpg flex plate

Also note the crankshaft adapter.

You can use the flywheel off the A14 on the A15. The thing to look at is the back of your A15's crankshaft -- make sure it has the hole for the trans pilot shaft bearing.

14851.jpg 14852.jpg 21808.jpg

Clutch Fittings

Automatic cars don't have:

  • Clutch pedal
  • Clutch master cylinder (LHD models)
  • Clutch cable (RHD models)

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This page has been accessed 7,193 times. This page was last modified 00:04, 9 July 2016. Content is available under Datsun 1200 Club.