Hydraulic Cylinder replace...easy Just got done replacing new top cylinders and lines...flushing the pump...refilling...and refilling .and refilling till the rods both actuated at the same speed.....the plug even came out (without breaking)...and popped back in..the top hasn,t worked this good in 20 years....plus now its not puking fluid all over the back seat foor......was easier that i thought...the car is a 68 Skylark.... Glad i did it my self instead of shelling out coin....The more crap i do the more i love this hobby. Best of luck to all!!! :TU: I did keep the Year-1 instruction sheet if any one needs it posted...LATER!!