I did this job a few days ago on my '81 TD. The tutorials all said to remove the rotor, but really it is not necessary. It makes it a little harder to secure the hub when driving out the races, but is doable.

Be sure to use the right punch when driving out the races. There is not much of an exposed race lip to drive against and it is easy to chip/distort the hub shoulder. I messed it up a little until I ground the punch to make better contact with the lip.

My HF dial indicator won't measure less than a thousanth inch, so I had to eyeball the max. .0008 endplay as the needle moved between the lines on the scale.

__________________
1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"