Transmission Flush
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Freshman User
Joined: Sep 2002
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From: Friendswood
Transmission Flush
I bought a truck 91 F150 used and believe the put the wrong fluid in the AOD Transmission. I have seen ads for Transmission flushs but how is this done and can I do it. I've changed the fluid and filter but not sure I cleared all the old fluid out, ie the lines to the cooler and the cooler itself.
Junior User
Joined: Sep 2002
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Transmission Flush
Opinions vary on the benefits of flushing a tranny, especially older ones. Perhaps yours is a rebuild, I don't know. ATF is full of detergents. If your tranny hasn't seen regular service, new ATF can break down the varnish and crud that can form on the clutch pads, and you may find slippage afterwards. Flushing removes much more fluid than just dropping the pan and draining. Some would say you are better off doing a couple of ATF changes close together to get things right. That gets the old stuff out more gradually. To me, that doesn't make total sense. You're still cleaning the tranny with new ATF, just more slowly cuz it's mixed with old stuff. I do know several folks who have had bigtime problems flushing trannys that were not routinely maintained. They were not Ford vehicles, but I doubt that matters. The problems were all related to slippage. If you haven't already, try a search on tranny flushes. Should be some threads that may help.
Transmission Flush
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