You can swap a transmission mostly DIY might need help to wrangle the thing around, but I don't think any fancy tools are needed, I even saw a trick where a guy put a dolly under the xm, blocked it tight with wood blocks and then lifted the from of the car up to pull the xm out the front of thre car. Clever no lift solution. I would probably use a floor jack and some wood like I did with the transfer case.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)