Air retract system converted to hydraulic with ATF?
Holeshot,
Keep in mind that petroleum based oils will dissolve petroleum based seals/packings. Keep the seals and oils separated by the base.
Petroleum seals/synthetic oil. Synthetic seals/petroleum oil.
O rings are available in several hardness compounds.
Are you considering a pressurized reservoir/accumulator to power your system, weight is going to add up really quickly.
R. C.