Lime works great in most mud.
We have laid a post across the back of rear tires,chained through the wheel,
Locked differential, put in reverse to turn wheels 1/4 turn which jacks the tractor up on top of the post. Then fill in the ruts with logs,or rocks,bricks then unchain post and drive out or get it to where another vehicle can pull easier.This is a last resort once we have gotten everything that can pull stuck also. It is a good way to raise the tractor off high center versus fighting a jack sinking in the mud.