First thing is make sure you know what that slurry is - take a swipe of it on your finger and smell it. Drive lube smells - A LOT. Grease will have almost no smell. You'll know, immediately.
If it is drive lube and water, you have three problems, a leak behind the yoke and water into the bellows along with possible damage to the u-joints.
If it is grease, then you also have two problems - a water leak, can be in the shift link area, or the ends of the bellows. And possible u-joint damage.
I had a drive that always leaked into the shifter area, and eventually into the u-joint area. I did learn to glue the big o-ring into the bell housing, that helped some, but that o-ring as far as I am concerned doesn't actually do a good job of keeping water out of the u-joint bellows. If there is water in the shifter lever area then there is also water in the lower shift cable housing. Which is a long term no no. It will cause the cable to start binding unless you clean it out and get it dry. Don't lubricate the shift cable. Just clean and dry.
A corroded or misplaced water passage o-ring can put water under pressure into the bellows.
And the drive to bell housing gasket is a gimmee. If it pooched out or the bell housing or drive gasket surface has corrosion it can leak. And as I said, it will get past the big o-ring. If no sign of water in the shifter area, then you have a bad bellows connection to gimbal housing or bell housing.
Rick
