Since everyone else has posted useful helpful information about how

to do this, I won't feel so bad about posting something negative:

I would not do this; I would instead teach her how to drive a manual.

The BW35, aka mushbox, is the only transmission you will have a reasonable

chance of installing in this car. It is not a very good transmission

and is frequently the reason why otherwise good volvos wind up in the

junk yard. I've talked to lots of people about these things and all of

them say about the same thing "they're not terribly reliable and nobody

has ever been able to rebuild one in such a way that the car worked for

very long."

I'd say go ahead and do it so long as you don't need to cut anything

or destroy anything to get the transmission into the car; keep the old

transmission in a clean dry place and when the slush box dies you can put

the M41 back in and hopefully your wife will like the car enough that she

will learn to drive a standard so she can keep driving the car.

If you can, buy an automatic equiped 140; drive the car around before

buying, and use the parts from that to put into your 1800; otherwise you

can't be sure the transmission actually works.

Automatic equiped 140s in my area go for about $300-600 depending on

other factors; you're likely to wind up paying that much for bits and

pieces otherwise and you won't have any way of testing the transmission

until it's actually in the car.

chris