Mercon II or III?
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Elder User
Joined: Oct 2002
Posts: 861
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From: Marysville Wa
Mercon II or III?
hey, i had an AOD tranny (i just nuked it (hard time to learn about the tv cable)) And i have been putting in it DExtron/Mercon III ATF. felt like it has been running fine, i recenlty looked at the dipstick tube and it says to use mercon II under warrenty. well i am now puting a new AOD tranny in my rig, but have like 9 quarts of leftover un-used Dextron/Mercon III tranny fluid.
Does anybody think this stuff is bad for my trans?
whats the difference between the two fluids?
Does anybody think this stuff is bad for my trans?
whats the difference between the two fluids?
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
Mercon II or III?
Hi jojo,
I don't think you could find any Mercon II or Mercon III around in the stores even if you wanted to.
Today you will only find Mercon and Mercon V.
Ford now recommends Mercon fluid for the AOD tranny. So that's what I would use if I were putting one in my rig.
Here is a pretty accurate list of current ATF fluid applications:
Type F — Introduced by Ford in 1967 for their automatics. Also used by Toyota.
Type CJ — Special Ford fluid for C6 transmissions. Similar to Dexron II. Must not be used in automatics that require Type F.
Type H — Another limited Ford spec that differs from both Dexron and Type F. Can be replaced with Mercon.
Mercon — Ford fluid introduced in 1987, very similar to Dexron II. OK for all earlier Fords, except those that require Type F.
Mercon V — Ford’s newest type, introduced in 1997 for Ranger, Explorer V6 and Aerostar, and 1998 & up Windstar, Taurus/Sable and Continental. Must not be used in 1997 or earlier Fords.
Dexron — General Motors original ATF for automatics.
Dexron II — Improved GM formula with better viscosity control and additional oxidation inhibitors. Can be used in place of Dexron.
Dexron IIE — GM fluid for electronic transmissions.
Dexron III — Replaces Dexron IIE and adds improved oxidation and corrosion control in GM electronic automatics.
Dexron III/Saturn — A special fluid spec for Saturns.
Chrysler 7176 — For Chrysler FWD transaxles.
Chrysler 7176D (ATF +2) — Adds improved cold temperature flow and oxidation resistance. Introduced in 1997.
Chrysler 7176E (ATF +3) — Adds improved shear stability and uses a higher quality base oil.
Genuine Honda ATF — Special ATF for Honda automatics.
Toyota Type T — Special formula for Toyota All Trac vehicles and some Lexus models.
I don't think you could find any Mercon II or Mercon III around in the stores even if you wanted to.
Today you will only find Mercon and Mercon V.
Ford now recommends Mercon fluid for the AOD tranny. So that's what I would use if I were putting one in my rig.
Here is a pretty accurate list of current ATF fluid applications:
Type F — Introduced by Ford in 1967 for their automatics. Also used by Toyota.
Type CJ — Special Ford fluid for C6 transmissions. Similar to Dexron II. Must not be used in automatics that require Type F.
Type H — Another limited Ford spec that differs from both Dexron and Type F. Can be replaced with Mercon.
Mercon — Ford fluid introduced in 1987, very similar to Dexron II. OK for all earlier Fords, except those that require Type F.
Mercon V — Ford’s newest type, introduced in 1997 for Ranger, Explorer V6 and Aerostar, and 1998 & up Windstar, Taurus/Sable and Continental. Must not be used in 1997 or earlier Fords.
Dexron — General Motors original ATF for automatics.
Dexron II — Improved GM formula with better viscosity control and additional oxidation inhibitors. Can be used in place of Dexron.
Dexron IIE — GM fluid for electronic transmissions.
Dexron III — Replaces Dexron IIE and adds improved oxidation and corrosion control in GM electronic automatics.
Dexron III/Saturn — A special fluid spec for Saturns.
Chrysler 7176 — For Chrysler FWD transaxles.
Chrysler 7176D (ATF +2) — Adds improved cold temperature flow and oxidation resistance. Introduced in 1997.
Chrysler 7176E (ATF +3) — Adds improved shear stability and uses a higher quality base oil.
Genuine Honda ATF — Special ATF for Honda automatics.
Toyota Type T — Special formula for Toyota All Trac vehicles and some Lexus models.
Last edited by Rockledge; Jun 27, 2003 at 09:08 PM.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
Mercon II or III?
Opera,
Many times Mercon V is recommended for use in the AODE/4R70W (all years) due to "shudder" issues. Other than that, Ford says not to use Mercon V in '97 and earlier trannies.
There is a good reason NOT to use Mercon V in older ATs. The clutch material prior to '98 in FWD vehicles, and in many RWD vehicles prior to '96 are not designed for this type of fluid and it's additives.
There is good info on it here.
Many times Mercon V is recommended for use in the AODE/4R70W (all years) due to "shudder" issues. Other than that, Ford says not to use Mercon V in '97 and earlier trannies.
There is a good reason NOT to use Mercon V in older ATs. The clutch material prior to '98 in FWD vehicles, and in many RWD vehicles prior to '96 are not designed for this type of fluid and it's additives.
There is good info on it here.
Elder User
Joined: Aug 2002
Posts: 886
Likes: 0
From: Cincinnati
Mercon II or III?
That basically only the 5R55E started using V in '97 and some other vehicles later in that transition year. I had been under the impression that they had all switched that full year. Makes sense the the problem child Explorers changed first. Learn something every day.
Last edited by Opera House Works; Jul 3, 2003 at 11:16 AM.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Mercon II or III?
You are right about the 5R55E ...it goes into the Ranger too and some of the later '97 Rangers with that tranny do require Mercon V. 
Similarly, I've also heard that some of '97 Taurus/Sables came with the "new" AX4N tranny (not the AX4S) and they too would require Mercon V. FWIW, I have the AX4S in mine and cannot use Mercon V.
Here is another relevant thread.
Similarly, I've also heard that some of '97 Taurus/Sables came with the "new" AX4N tranny (not the AX4S) and they too would require Mercon V. FWIW, I have the AX4S in mine and cannot use Mercon V.
Here is another relevant thread.
Last edited by Rockledge; Jul 3, 2003 at 01:39 PM.
Junior User
Joined: Apr 2003
Posts: 98
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From: Redondo Beach
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Senior User
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I've got an AOD in a Mustang, I did a tranny service. I used the O Reilly equivalent for the dex/ merc ATF, now I loose overdrive at 40 mph and the tranny seems to slip in drive also. I just realized the dip stick says Mercon 2. I checked the ATF bottle it says use where Merc/ Dextron 3 specked. Im thinking I just messed up a good tranny.
On the back it says it is compatable with Ford trannys calling for Mercon ATF.
Not compatable with Mercon 5.
On the back it says it is compatable with Ford trannys calling for Mercon ATF.
Not compatable with Mercon 5.
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