On those one piece units... There are a few pointers I picked up some years back... Some of these units are pre-filled with brake fluid from the factory. Do NOT open the fluid cover until the installation is finished (you only need to open it to check the fluid level after the install). Also, do not try to take the unit apart (as in don't disconnect any lines). The whole thing must be installed in one piece or you will get air in it and have a bugger of a job getting it back out. Be careful not to push on the pedal push rod until the unit is fully installed. Take it slow and easy snaking the tubes into place (a helper is good here). I'm not a big fan of plastic in vehicles but these hydro clutch setups do last a long time. I installed one of these on my 89 Dodge Cummins truck 13 years ago when I did an automatic-to-manual conversion and it still works fine. Best of luck and happy Jeepin' - John