Converting 405 from automatic to manual transmission

Hello
I have a 1996 405 (2000) that I am trying to convert to manual transmission. I've worked on the automatic transmission about 4 times
now, and it keeps going out after a few months. It's like finding gold, getting a new 405 transmission in Jamaica, so I'm think of going manual.
Has anybody tried this?
Does anybody know what's involved?
Does it work?
OLI
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Wrong way OLI!
I went auto about 40 years ago when the vehicle I wanted was only available in auto ( a second-hand EH Holden). I have never gone back and never will.
OK - I probably use a bit more petrol. But autos, unlike clutches, are made to similar tolerances as engines. More importantly, they are not subject to human error in the way clutches are.
We have four road vehicles here - all auto - and four farm vehicles (mostly diesel manuals).
And autos with a lock-up top gear would yield economy very close to manual.
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Ken wrote:

That's all very well but you have access to spare parts there can't be anywhere in Oz that you can't get a Holden fixed.
Oli is in Jamaica and wants a Peugeot auto box fixed and they are as he says rarer than gold dust - gold dust in Jamaica mind not Oz.

It's not a matter of fuel economy, rather practicality.
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Thanks for your comments guys, but I've already decided on it. Thanks a lot!
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Never tried it but I would think that there would be a fair amount of work involved, though it must be possible. The engine will be the same, but everything from the flywheel on will have to be changed, and then the gear lever etc. I suppose if you can find all the bits, or have a donor car then it should be possible, but make sure that you get a gearbox from the same engine etc, as the internal gearing will be wrong otherwise.
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