6SPD fluid?
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Elder User
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From: North Idaho
6SPD fluid?
I have a '99 F350 4x4 7.3 PSD with a 6 SPD tranny and my owners manual says to use only Mercon ATF. I was wondering if Dextron III is compatable or if I have to go with the Mercon?
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Elder User
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From: North Idaho
Originally Posted by cookie88
I suggest a synthetic Mercon.....Quiet and smooth.
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Joined: Aug 2004
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From: SHELTON, WA
i just replace mine about a month ago with royal purple synthetic atf....didnt work so hot....
found out later they make a special atf called "ROYAL PURPLE SYNCHROMAX" specially designed for manual trannies that require atf...
i put that in yesterday.....works 10x smoother now..even though mines a zf5 they still call for the same fluid.....it was about 30 buck for 4 qts.. i am sure the zf6 holds more seeing how you got a cooler...
fwiw good luck.
found out later they make a special atf called "ROYAL PURPLE SYNCHROMAX" specially designed for manual trannies that require atf...
i put that in yesterday.....works 10x smoother now..even though mines a zf5 they still call for the same fluid.....it was about 30 buck for 4 qts.. i am sure the zf6 holds more seeing how you got a cooler...
fwiw good luck.
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Joined: May 2001
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From: Cabot, Arkansas
Originally Posted by pbr man
I use Conklin synthetics in all my vehicles. I started using them over 10 years ago in my logging trucks and highway trucks, Peterbilt and Kenworth with 3406 Cat motors. I gained 1/2 mile per gallon average fuel mileage- 700 gallons per year savings- and dropped the tranny and rearend temps between 65-85 degrees. I also use Conklin oils in my personal vehicles and have had excellent service with them. The ATF I have is Dextron III and would like to use it in my 'new to me' Super Duty and need to know if that will replace the Mercon?
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From: STEPHENVILLE,TX!!!!!
kinda funny ford manual says mercon v
but the tranny tag and zf says FULL SYNTHETIC ONLY
i run amsoil atf in mine works great.
but the tranny tag and zf says FULL SYNTHETIC ONLY
i run amsoil atf in mine works great.
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
''kinda funny ford manual says mercon v
but the tranny tag and zf says FULL SYNTHETIC ONLY''
i think you need to reread it. mercon v is for use in the 4R70w and the 4R75E.
but the tranny tag and zf says FULL SYNTHETIC ONLY''
i think you need to reread it. mercon v is for use in the 4R70w and the 4R75E.
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Elder User
Joined: Nov 2005
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From: North Idaho
I just went to ZF 6Spd web site for technical specs and it says to use dextron III, Mecon , or full synthetic so I can use the oil I have. Thanks for the reponses. This site has helped me in a lot of ways with all the good tech advice from the people here. Thanks again. Eric
Senior User
Joined: Apr 2005
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From: NH
Originally Posted by dunbar15
I used mobil 1 ATF synthetic, is this OK ?? Have 140K on tranny with
no problems that I know of .. Knock on wood..
no problems that I know of .. Knock on wood..
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