theory and reality often never coincide getting the stuff is one reality check. second is that 1st 2nd and 4th are all dictated by the layshaft which in turn dictates the input shaft
so theoretically you can have a dyane lay shaft and a 2cv input .....but it'll lock been there done that trying to assemble a box from a bigger crate containing the internals of numerous dead gearboxes.

DSC00122 by Sean602, on Flickr

but there is a considerable amount of messing about you can do
dyane diffs on 2cv ratios and vice versa gives a long box and a short box and its not the first time a car has finished the 24hrs using one

i love this forum Russ if Jon dosn't need that gearbox I will take it off your hands

Quite interesting reading, not that much of it makes a lot of sense,
One of missions this winter is to learn about gear boxes, I've got one in the garage I'm going strip apart, and try and learn about them, realistlcily that'll happened but It does interest me

James one I did yesterday, had a cracked bell housing due to a broken chassis, thought I would give it a go, just got to put it back together again

Hi Simon,
there are a few things which are worth doing when you're that far into a gearbox, which will pay dividends in longevity and reliability.

Peening the selector ring to prevent it unwinding, replacing the rear bearing on the main shaft and torquing the rear nuts properly, as well as securing both of them with Loctite.

Some guidance notes here; http://www.flickr.com/photos/30132857@N06/page11/

ken

Thanks Ken, Spanners already mentioned the peening it looks a good gearbox the car it came out of had very little mileage, will have a look at the link thanks, are all the gaskets still available?

cheers

Simon

Hmm looks complicated but I guess if I never get stuck in I won't learn,
My box in question is an unknown quantity