Yes. By gearbox I mean the transmission.
For this particular endeavor the jack goes under the transmission support on the side where the bolts are removed, in this case the left side. It would be a good idea to put a jackstand or something sturdy on the other side as a safety measure.
If you really want to disconnect the driveshaft I won't talk you out of it. But I have done this many times without and to no ill effect. To me, it's just more stuff to get in the way while working under the car. The driveshaft will move forward imperceptibly but it is designed that way.
The transmission really doesn't have to come down that much. Let it down a little, check underneath, let it down a little more if need be.
If this sounds unsafe, well many procedures that we talk about here can be if done imprudently. Please be careful and if you don't feel confident, don't set about this task.
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'80 DL 2 door, '89 DL Wagon, '15 XC70 T6
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