Is that 6-7k for a rebuild or for a completely new transmission?

There's plenty of wrecked C240s out there that could yield a good used transmission at a 1/3 of the cost.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!