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I changed mine (AW70) about a year ago. The bushing was warn to about half thickness after 300k miles. Yes the gasket has to be scraped off and the case is pretty soft aluminum so be careful not to scratch the gasket surface. I used a 1" putty knife and some gasket remover.
The trans has to be drained so this might be a good time to replace the filter screen. Pan gasket (came off easy) and screen in kit from local auto parts was about $10 US. Put the car up on stands as high as you can. The trans cross member has to be removed so have a jack to hold up the trans. The tail can be dropped down a little for easier access but watch that the engine does not contact the fire wall at the head. Some fluid will still run out when you remove the tail so have an oil pan ready.
There is a square notch in the tail housing which the green manual says not to line up the hole in the bushing with. This notch is wide and deep so I used a hacksaw blade to split the bushing and it came out easily. One thing is that even the new bushing is not a close fit to the driveshaft flange. You can still wiggle the shaft after the installation.
Again, this may be a good time to replace U joints and center bearing.
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