Got a slipping transmission in a newly acquired 75 D100. I am going to change the fluid and filter and adjust the bands. I have seen a method of turning the driveshaft until it stops and backing off the band adjustment. I have also seen the oem method of 72 in/lbs and back off. I have not seen for either method what gear the transmission needs to be in or if it even matters. So, this is my dumb question for the new year.

What gear do I shift the trans into when adjusting the bands?