Discovery3

I have a 2006 Discovery 3, which I have appreciated for 3 years. It is an automatic.
It now has a gear box issue with a fault between 3rd and 4th gear, and throws the system into a fault mode.
I have tried everything to fix it…replacing the transmission…gearbox and transfer case…etc but to no avail. This was done by a mechanic.
I think I have come to the end of my patience with it….So…the question is
1. what is the best way to sell it…which websites?
2. It still has a valid MOT…in-fact it just got it…so sell it or break it?

Thank you for your time in advance…I am open to sensible offers…

You don't mention the torque converter which is usually the main issue with the d3.

WHCI said:

I have tried everything to fix it…replacing the transmission…gearbox and transfer case…etc but to no avail. This was done by a mechanic.

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What's "etc" ??? ... it implies reading the fault code with dedicated scanner too? ...if not sell it to that mechanic who replaced the gearbox and transfer box without properly diagnose it cos it can be an electrical issue which is revealed only by the fault code

OK I know about these faults you can't just change the gearbox on a D3 and expect it to work.
For starters it will need codeing to the car which requires dealer software or the gap tool fully unlocked at its most expensive level.

The replacment gearbox just won't work on another car until this has been done.

If the op comes back I will give him more info and a link

There's a torque converter in the boot...

and to the left is a transfer box? or is it? (Don't know the D3.)

No, that's a 6HP26 transmission... Presumably the original one.

Graculus said:

There's a torque converter in the boot...

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I didn't look at the pictures I suspect the op is just trying his luck at selling it on ......I'm pretty sure I know what needs doing to sort it ........have looked at the pictures and its a bit of a shed by the look of it

It wasn't an entirely serious or helpful comment - purely for the reasons you mention.