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Cats Citroën Net A-type gearbox recognition

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Old Type Gearbox

Black steel cover
Gearshift lever on seperate housing mounted on the back of gearbox
Drum brakes

A AU (1949-1956)

AZ AZU (1954-1963)

AZ AZU (1963-1970)

Ami6 AK (1961-1970)

New Type Gearbox

Alloy cover
Gearshift lever central on the cover
Disc and drum brakes

Ami6 (1968-1970)

2cv4 Dyane 4 (1970-1978)
20mm fine splines
2 edges (where?)
drum brakes

2cv6 (1970-1990)

Dyane Acadiane (1970-1990)

Ami 8 (1970-1978)

Disc brake gearbox ratios

Is this disc brake gearbox from a 2cv or from a Dyane/Acadiane/Ami8?

Method 1:
  • Remove the gearbox lid.
  • Count the number of teeth on the front most gear on the uppershaft.
  • 19 teeth is 2cv, 20 teeth is dyane/acadiane/ami.
Method 2:
  • With gearbox in the car:
    • Jack up one wheel.
    • Put the car in first gear.
    • Mark a point on the ventilator.
    • While turning the lifted wheel 1 revolution, check how many revolutions the ventilator makes.
  • With a seperate gearbox:
    • Block 1 driveshaft end.
    • Put the gearbox in first gear.
    • Mark a point on the input shaft (use old clutch plate or a welding clamp).
    • While turning the other driveshaft end 1 revolution, check how many revolutions the input shaft makes.
  • On a 2cv gearbox, the ventilator / input shaft makes 10 3/4 revolutions.
  • On a Dyane/Acadiane/Ami8 gearbox, the ventilator / input shaft makes 11 1/4 revolutions.
  • Note that the difference is only half a revolution!
Method 3:
  • Jack up one wheel.
  • Put the car in 4th gear.
  • Mark a point on the ventilator.
  • While turning the lifted wheel 1 revolution, check how many revolutions the ventilator makes.
  • On a 2cv gearbox, the ventilator makes 2 3/4 revolutions.
  • On a Dyane/Acadiane/Ami8 gearbox, the ventilator makes 2 1/2 revolutions.
  • Note that the difference is only a quarter a revolution!

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