If "PS" stands for Power Steering, then PS transmission parts might be a between power steering components and transmission parts. These are two separate systems in a vehicle:
Power Steering Parts (PS):
Power steering pump
Rack and pinion or steering gearbox
Power steering fluid reservoir
Hoses and lines
Transmission Parts:
Torque converter (automatic)
Gears and gear sets
Clutch (manual)
Valve body
Transmission control module (TCM)
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