You must get a gearbox from another AWD car as you need the transfer box drive.
Whilst the ratios maybe the same - the final drive are not - one from a petrol car would not be suitable. Not sure if the final drive differs between 60, 70 and 90 models. You should retain your ECU.
I have successfully dropped a number of gearboxes into XC90s from different year and model Volvo cars but always the earlier 5 speed AW55.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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