I talked to Wayne brewer when I was up there and he has concerns about using a hydraulic throw out bearing. The idea of introducing a fluid into an area you want kept dry wasn't a good one. QUOTE]
My 91 Cherokee with 4.0 liter and manual 5 speed (T5) used a hydraulic throw-out bearing. Everything was fine until around 120K. I would be sitting at a stop with the clutch in and the Jeep would start creeping forward so I had to change it, a little spooky but no biggie.
Also, IIRC, the previous generation Camaro/Firebird used a hyd throw-out bearing with their Tremecs. I've met Wayne and talked to him, nice guy, but...he needs to update his thinking.