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The rear axle is about 5mm wider, but the factory a me will have to be binned anyway to fit the awd one (which is based on a 700/900 rear axle)

Also increasingly common for them to be using redblocks and T5 lumps

http://forums.t5d5.org/topic/15067-volvo-850r-awd-saloon/

Here's the one I was referring to.

It's not uncommon in the ford world for people to weld Sierra and Escort floorplans and bulkheads to FWD cars. If you had the skill set I'm sure it could be done with a Volvo.

It's been done in Australia

https://ozvolvo.org/discussion/329/rob-s-c70-t5-awd/p1

Just buy one of these mate & get it shipped home from Lagos....

https://www.cheki.com.ng/vehicles/1999-volvo-s70-lagos-nigeria-a313228.html?click_source=car_title&page_number=1&position_number=1
...

I've looked into it, and the engineering involved is just a nightmare. The AWD uses a totally different rear suspension, which use mounting points that aren't on a standard 850/x70 floorpan. The AWD...

Someone done it to a 854R. Not sure where the thread is but think its on T5D5.

I wouldn't bother. The cost would outweigh the unreliable outcome. Awd is a mine field of engineering part changes & not the best of designs.
I absolutely hated working on my v70r awd in the end....