123 trans is in. Didn't swap the tails yet, just get it back on the road. 123 trans appears to have many newer parts, including the b2 piston upgrade. Someone went through it or had been rebuilt. Shifts well. Just need to work on getting it set up.

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1982 300sd, new project car to restore

It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.