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The overdrive is part of the transmission. It's a fairly easy swap on a 122, once you've tracked down the M41 transmission. The overdrive unit is an 11.5(ish) inch long lump that bolts on to the back of a 4 speed transmission (no, unfortunately the transmissions are not the same - the OD trans has a very long output shaft). When installing, you will need to shorten your driveshaft to match - unless you got the driveshaft from the donor vehicle as well. You might also have flange issues - I think Volvo used three different flange sizes, . Worst case you could always just take your driveshaft to a driveline shop and have them shorten it and weld on an appropriate end.
Disc brake rear ends - might be nice to look at behind some wheels that show off your brakes. 1800E and ES (the late production injkected ones) had disc brakes on what is basically a 122 rear axle - and that is a near (or actual) bolt in for a late (67-) 122 sedan or coupe (wagons are different). You'll have to do a little fabrication to put one in an earlier car, though. Another issue with an E/ES axle is that the bolt pattern will change - from the 4.5 inch early pattern (shared witl Mustangs, Mopars, Jeeps, small pickups, lots and lots of cars) to the 4.25 (actually metric I think) late patter shared with newer Volvos and maybe the odd newer Ford product.
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I'm JohnMc, and I approved this message.
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