We have a 1989 190e and we want a spare transmission for it in case the one in this car goes out. I found a good deal on a 190d 5 speed with flywheel and I'd like to pick it up. I want to be able to resurface the flywheel and bolt in this trans with a new clutch in the event the current transmission needs to be rebuilt. Before I drive out to it though I'd like to make sure there is nothing I am missing. I understand the ratios are different but other than first they're not that different and would make a good spare.

Based on this Mercedes manual transmissions | Mercedes-Benz turbo it looks like it should be fine.

EDIT: If anyone is wondering this trans has started to grind the 1-2 shift and I'm sure its only a matter of time since this car only sees track use.