I am looking to buy a secondhand diesel double cab automatic gearbox.

Preferably 2 WD.

Anybody out there that can direct me to a retailer with a wide range of objects please.

It's depend where you living, and how much you'll like to spend, go shop arround. If you like Toyota or Isuzu, you'll pay top prices, maybe better to consider on a new one. If you buy Ford, Mazda, Mitsu or Nissan, you'll find them in the lower price range. That's all i guess, there is not much choice in Thailand. Basicly it doesn't matter what you buy, It's all the same, 4 cylinder diesel! So why not go for a Chevrolet or Ford and save some money. BTW Chevrolet is Isuzu (same car different face), same technology, Chevy just looks better and is cheaper in the used car market

If you consider on a new one, i have a frend in BKK who exports New Pick Up Trucks to South Africa. So he have his own stock and very good conditions. I can give you his Phone Number if you want.

Good luck.