ATF Change
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Junior User
Joined: Aug 2007
Posts: 97
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From: Alabama
ATF Change
I was looking in Mods and Maintenance on chainging the Transmission fluid and was wondering if anything has changed or been updated.I have replaced the strainer 3 times but have never done a complete drain of the system.Ford said that they no longer made Mercon and just made Mercon V for everything and it would be ok to use.Thanks
Freshman User
Joined: Jun 2008
Posts: 36
Likes: 0
Some questions about ATF change (Mercon->Mercon V):
1. Which methods are correct for fluid change (after removing the transmission drain plug and draining the transmission fluid):
Method 1. Apply the break(pedalbreak or handbreak). Start the engine and run it at idle speed for five minutes while shifting through all shift lever positions.
Method 2. Start the engine and run through all gears for a total of five minutes at idle.
- Is idle enough to mix fluids? Or middle speed better?
- What is better: running with break or without break?
Method 3. Start the engine and run at MIDDLE speed through all gears for a total of five minutes.
- Can middle speed (instead of idle) damage the transmission?
2. Is 5 minutes enough to mix fully new fully ATF with old ATF?
3. How many times do you recommend repeat this steps?
1. Which methods are correct for fluid change (after removing the transmission drain plug and draining the transmission fluid):
Method 1. Apply the break(pedalbreak or handbreak). Start the engine and run it at idle speed for five minutes while shifting through all shift lever positions.
Method 2. Start the engine and run through all gears for a total of five minutes at idle.
- Is idle enough to mix fluids? Or middle speed better?
- What is better: running with break or without break?
Method 3. Start the engine and run at MIDDLE speed through all gears for a total of five minutes.
- Can middle speed (instead of idle) damage the transmission?
2. Is 5 minutes enough to mix fully new fully ATF with old ATF?
3. How many times do you recommend repeat this steps?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Some questions about ATF change (Mercon->Mercon V):
1. Which methods are correct for fluid change (after removing the transmission drain plug and draining the transmission fluid):
Method 1. Apply the break(pedalbreak or handbreak). Start the engine and run it at idle speed for five minutes while shifting through all shift lever positions.
Method 2. Start the engine and run through all gears for a total of five minutes at idle.
- Is idle enough to mix fluids? Or middle speed better?
- What is better: running with break or without break?
Method 3. Start the engine and run at MIDDLE speed through all gears for a total of five minutes.
- Can middle speed (instead of idle) damage the transmission?
2. Is 5 minutes enough to mix fully new fully ATF with old ATF?
3. How many times do you recommend repeat this steps?
1. Which methods are correct for fluid change (after removing the transmission drain plug and draining the transmission fluid):
Method 1. Apply the break(pedalbreak or handbreak). Start the engine and run it at idle speed for five minutes while shifting through all shift lever positions.
Method 2. Start the engine and run through all gears for a total of five minutes at idle.
- Is idle enough to mix fluids? Or middle speed better?
- What is better: running with break or without break?
Method 3. Start the engine and run at MIDDLE speed through all gears for a total of five minutes.
- Can middle speed (instead of idle) damage the transmission?
2. Is 5 minutes enough to mix fully new fully ATF with old ATF?
3. How many times do you recommend repeat this steps?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
Follow the instructions the F350-6 posted. That's the way to do it. One caveat, though. The instructions are a bit out of date. MERCON V has replaced MERCON.
Elder User
Joined: Feb 2004
Posts: 772
Likes: 3
From: Mount Airy, MD
I was looking in Mods and Maintenance on chainging the Transmission fluid and was wondering if anything has changed or been updated.I have replaced the strainer 3 times but have never done a complete drain of the system.Ford said that they no longer made Mercon and just made Mercon V for everything and it would be ok to use.Thanks
BG Automotive Maintenance Services
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I just had my tranny and power steering done. The tranny flush was only $125.50. To me, for that price it isn't worth fooling around with it myself. That price included the new fluid.
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