A OEM Volvo reman. auto. trans from any Volvo dealer costs about $1,600 plus labor, a 10 hour job and comes with a 1 yr, unlimited mileage parts warranty.

As for doing a manual conversion, although it's possible, it will be a very time consuming job and one would need to find a wrecked doner car for all the parts. It will likely need a fuel system ECU and possibly an engine wiring harness too besides all the other more obvious items and unless you're doing all the work yourself, I wouldn't consider it as anyone would charge you alot of labor (straight time) as it will be a major project. Most shops are not likely going to want to try that due to the time factor and possible unknown problems.