Now heres one for the tech experts out there in I2F land - did they only do one gearbox for the cars fitted with a 602 engine?

Technically no, the old M4 type 602 used the tin top gearbox, but that's all pre 1970 so I assume you're not interested in those.

The M28/1 602s all used the same gearbox although the ratios vary depending on what it's fitted in 2cv, dyane, ami, etc. Also '70s used drum brakes, '80s used discs (approximately).

There's a list of ratios here if you need it, 3/4 of the way down, Gearbox, Modern type.

http://cats-citroen.net/citroen_atypes/ ... arbox.html

But iirc racers are only allowed the 2cv gearbox ratios.

As in 602s in any A series.

Pre 1970 there were all sorts of shenanigans. The 602 M4 was mated to various boxes in the Ami 6, AK350, 2cv, Dyane, etc...

However I think there were also different versions of the later 602 box. The AKS400 and Mehari share a 'low' ratio box (there's a chasm between 1st and 2nd, on the Mehari I generally pull away in 2nd unless I'm towing).

too loose a definition.

if its for the Minty one then im afraid its late type disk 'box and its ratios.

earlier 2cv4 with their lower ratios were popular for sprint boxes but if youre caught with one you'll be in trouble.

the scrutineers however dont know what their looking at.

Sean

http://www.gearbox-guru.co.uk/

Rick Pembro does hybrid boxes - I've always wanted to try something along the lines of AK 1st, 2cv 2nd and 3rd and Dyane or Ami 4th. But that would be a very looooong gearbox.

There are something like 37 theoretical ratio combinations that can be created from the standard Citroen ratios. Or so I'm told by someone I know in Belgium who rebuilds boxes.

Thanks for the answers - Sean it was out of interest really (a nagging in my head about gearing), going back to my short circuit days, we had 3 different gearboxes and 10 different diff's that we used to change week in week out various combinations long box, 3.9 diff , short box with 4.4 diff etc etc

I have a pair of 2cv4 boxes for sale, and if Jon doesn't want it I have a late disc box that needs a new home too.

Would they be suitable for my 425 AZ?

Not unless you wanted one for a specific purpose, off road or hillclimbing for example. It'd be a lot of effort to fit one of them and for everyday use they'd be a pain on the road. 2cv4s are nothing like 425s mechanically.