Hi, if memory serves me right. The earlier Volvo 760 gearbox is a direct fit to the T5 engine.
If I have the wrong model it was the model prior to the Volvo 850 & was fitted with the straight six engine.
The 4 cylinder red block engine, rwd box does not fit.
Early on I had thoughts of using the 850 lump. I gave up looking for a gearbox that wasn't silly money.