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Not sure which line is return.Just want to add you might want to think about adding a filter to you PS. It's an in-line transmission filter but works great on the PS..I change mine once a year...Just my .02
(Magnefine # M010CB 3/8 lines)
Does anyone know which line on the resivor is the return line?
I'm trying to drain it out and put new in.
It's the rubber hose on the top of the hydroboost unit. I used Mercon V synthetic 4 qts. I added app. 4 inches of hose to the boost unit and added the above mentioned Magnefine filter.
The link below will show you some pics of my fluid flush Old vs. New. My truck had 45k at the time and not sure if previous owner ever flushed.. Doubt it..