Flush auto trans fluid???
Thread Starter
Pro
Joined: Oct 2003
Posts: 732
Likes: 2
From: Baxter MN
Flush auto trans fluid???
My 2004 with auto trans is a virtually stock car. It has a Volant intake and BB cat back exhaust. Odometer shows 32000. Car is not raced nor driven very hard. My question is whether the trans fluid should be flushed? When I call GM dealers, all 3 said yes to a flush, but it wasn't necessary to replace filter. One mechanic explained that GM recommends a procedure where a chemicle is added to the old fluid. Then the car is driven to warm it up. Finally the fluid is flushed, and new fluid added. The chemicle supposedly ensures more thorough cleaning of deposits and build ups. And I was assured that this procedure even cleans the filter itself, so no need to replace.
I've never heard of anything like this before. Can anyone comment who has either had this done, or who went a different route.
TIA.
Glen
I've never heard of anything like this before. Can anyone comment who has either had this done, or who went a different route.
TIA.
Glen
Safety Car
Joined: Aug 2007
Posts: 4,506
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From: This is not a Song, It's an Outburst: Or, The Establishment Blues; Sixto Diaz Rodriguez
When I modded my engine, while it was on the rack, I let them change tranny, and gears, put RP in all, engine, tranny, and gears. I guess it won't hurt to change it for your peace of mind. Not sure about the added chemical from GM. Other guys will probably chime in with good info. 
Drifting
Joined: Sep 2008
Posts: 1,410
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From: Chicago IL
Instructor
Joined: Jul 2008
Posts: 138
Likes: 0
From: Valley Center CA
I had my 04 auto trans fluid changed abput a month ago at 47,000 miles. The dealer told me the same thing but I wasn't to comfortable with the way that sounded. Foud a corvette shop to do the trans , diff and radiator fluid exchange and they did do the filter. The is no drain plug on the auto trans sothe pan has to come off to change the fliud. The fliter is a $30 part. While he's was in there they agreed that chancing it was some peace of mind for cheap. The macjanic also explained that there is a maginet in the bottom of the pan put in at the factory that catches any metal in the system. Mine was working as it should. A few bits of metal were stuck to it.
Le Mans Master
Joined: May 2006
Posts: 5,747
Likes: 224
From: Hillsboro Oregon
I am no expert in transmissions........
There is a power flush where the fluid and/or solvent is "flushed" backwards with pressure, sometimes high pressure. Many say this can dislodge crud that may end up getting stuck in new places where it may foul up your tranny. I think this is what one finds at most Jiffy Lube type places.
This is different from a "fluid" exchange where the new fluid is pumped through the entire transmission in the regular direction that trans fluid flows and the TC at regular trans pressures to pump out all the old fluid and replace it with fresh fluid........some also call this a "flush".
There is a power flush where the fluid and/or solvent is "flushed" backwards with pressure, sometimes high pressure. Many say this can dislodge crud that may end up getting stuck in new places where it may foul up your tranny. I think this is what one finds at most Jiffy Lube type places.
This is different from a "fluid" exchange where the new fluid is pumped through the entire transmission in the regular direction that trans fluid flows and the TC at regular trans pressures to pump out all the old fluid and replace it with fresh fluid........some also call this a "flush".
Last edited by jrprich; Aug 14, 2009 at 11:55 PM.
Le Mans Master
Joined: Jun 2004
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From: Seattle WA
St. Jude Donor '14
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