That slave cylinder was on a 89 C4, with 107k from Texas. You must understand the 2 slave cylinder units are mounted on the side of the transmission not in a covered area protected, so it becomes trashed very quickly by road grime.
Most C4’s need these replaced, but the car still works and drives so it’s a matter of wanting the locking differential
The 4wd still works but the system will not activate the locking differential automatically
Another big ticket item is the ABS control modular from Porsche $4100, used hard to fine, so I am beginning to think the C2 has many advantages in repair costs.
Plus these Models onward have a slave unit for the clutch assembly and a clutch master brake unit that is another cylinder type...
Then all motor mounts and transmission mounts should be replaced. And engine mounts on the 964 is hydraulic not solid big costs, I removed and used RS mounts.
The Customer is wanting it done still ....but is now on his way to a lot of costs, unfortunately.
The ABS unit for C4 is I think 52 pins and about 8 are broken, the C2 unit has one row less.
