unfortunately not much on the cheap, to put any other gearboxes in youll need conversion kits. the best bet is to pull it out yourself and dissasemble it, get a rebuild kit with bearings and gaskets preferably toyo (ebay 300-500 bucks) and take the gears in to get refaced and heat treated, youll save a fortune on rebuild costs. it wont be as cheap as a second hand one but then youll know you should get another 400 000 kms out of it. the 5 speed is a sturdy gearbox, mines done 396 000 and still drives like new the 5 speeds definitely a keeper!
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