Help doing trans flush
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New User
Joined: Jul 2019
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Help doing trans flush
Been doing a flush on my trans lines had it flushing for like 4 days and keep having black little plastic peices coming out of it no stop some times none and other times alot just cant figure out from where. Got new trans been gone through and converter new trans cooler just need to get it cleaned up before install plz help
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Did you have a trans go bad and now you're installing a rebuilt one?
If so you may have junk stuck in the cooler. This is why many rebuilders require a new cooler to be installed.
I would disconnect all the lines. Then fill the line with brake cleaner and blow it out with shop air backwards to dislodge and clean it out. Reality though if the cooler has that much crap trapped in it I'd rather replace it.
If so you may have junk stuck in the cooler. This is why many rebuilders require a new cooler to be installed.
I would disconnect all the lines. Then fill the line with brake cleaner and blow it out with shop air backwards to dislodge and clean it out. Reality though if the cooler has that much crap trapped in it I'd rather replace it.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
If you want the new trans to last you need to replace the radiator (to replace the internal trans cooler) and the external trans cooler. You can NEVER flush all the crap from a failed transmission out of the coolers. Sooner or later some piece of the old trans will break loose and find it's way into the new trans where it can grenade that transmission.
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Fleet Mechanic
Joined: Feb 2007
Posts: 1,652
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From: Mooresville, NC
I'd say you have better than 50/50 odds "something" has made its way back to that otherwise rock solid tranny.
In theory the external filter should catch "some" things, but it's a terrible design to begin with ---- I'd go with an upgraded 6.4 trans pan and upgraded (internal) filter arrangement too....................
In theory the external filter should catch "some" things, but it's a terrible design to begin with ---- I'd go with an upgraded 6.4 trans pan and upgraded (internal) filter arrangement too....................
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
It's a bypass filter. It only sees 10% of the flow to the cooler. So by design 90% of the junk in the ATF does not go through this filter.
Excellent suggestion.
Excellent suggestion.
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