How many gears bit the dust? I have a billion spare 'pot' metal gears so you might not need the entire transmissions. Or upgrade to steel ones.
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Tiger I - Panzer II - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant - SECRET PROJECT