Is the D300 AWD? I can see gear reduction not causing the suspension and brakes to go haywire with codes and lights if the thing is still running AWD.

Speaking of that, 205 is not AWD, if I recall correctly. 205 is selectable 2 or 4, I believe..like the D300?
203 is cast iron chain AWD...and I would use it to stay AWD and keep all the ridiculous computers happy.
Did you have to reinforce the transfer case mounting situation/cross member to accommodate the extra weight of the 300?

I intend on making a bumper like that and something for the rear as well at some point. It's great.

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2001 E53 3.0 5pd