Transmission cooler
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New User
Joined: Apr 2004
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Transmission cooler
while my truck is down for fuel troubles, I ended up changeing the transmission filter and fluid. How much extra Mercon do I need to put in when there is a transmission cooler? I alread put in the 4 and 1/2 qts that the book says to put. I think what I will do is to add the fluid as needed when I do get the thing running. Beings that the engine needs to be running and up to temp when the fluid is checked. 
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Joined: Mar 2003
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That is a really good question! I don't know but I would guess that it would be about one extra quart.I have the largest tru-cool max and I would bet that even with the new cooler lines it holds no more than that. 
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I will add a little extra fluid. I only added 4 qts when I put the fluid. I bought 7 qts and I have 3 unopened sitting in the front seat. I figure that if I add a 5th that it will not over fill it.
But on the other hand, I might as well wait tillI get it up and running again and check and add the fluid the proper way, while the engine is running.
But on the other hand, I might as well wait tillI get it up and running again and check and add the fluid the proper way, while the engine is running.
Logistics Pro
Joined: Feb 2000
Posts: 3,957
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From: Mesa
You should have drained the tq converter. You'll need about 12-14 qts this way. Since you changed the filter you might want to take it to a shop and have the fluid flushed. 4 qts really isn't a good service.
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Junior User
Joined: Mar 2004
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From: Northwest Houston
20007.3l 4x4 It took me 20 quarts to FLUSH and refill the tranny fluid. I flushed out about 2 quarts, so my truck holds about 18, dead on with the article I read about changing/flushing the transmission.
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