340 rear main seal question

85 foot pounds and you will have to completely remove the oil pan, oil pump, and rear main cap.
I used an old screwdriver with a 1/8 shaft ground flat on the end to get the top half of the rubber seal loose and started out.
Just center it on the seal end and a few taps with a hammer should do it.

If it's a rope seal you will need a sneaky pete seal puller.
A 3 inch deck or drywall screw works also, but you do have to be carefull not to scratch the journal's sealing surface.