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Some 2008 F-Super Duty vehicles equipped with a 5.4L or 6.8L engine and a manual transmission may exhibit high shift efforts when shifting into gears at cold ambient temperatures ranging from 0 to 40 degrees F (-18 to 4 degrees C). This is due to the viscosity of the current manual transmission fluid. ACTION:
Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE
Use the 2008 F-Super Duty Workshop Manual (WSM), Section 308-03: Manual Transaxle / Transmission - ZF 6-Speed - Transmission Draining and Filling.
Drain the fluid from the transmission oil cooler and lines.
Continue to follow WSM, Section 308-03 to properly fill the transmission to the correct level using Motorcraft® MERCON®V Automatic Transmission and Power Steering Fluid.
Shifting will improve as the new lubricant works through the manual transmission. The time needed to improve shift efforts may vary by driver and operating conditions.
replacing the gear oil with ATF? The manual transmissions don't even have oil coolers or lines, ...do they?
Now this actually is interesting...... Is Ford recommending the change just to counter customer shifting complaints, or because the recommended fluid doesn't lubricate well while its cold...?
Dads 06 5.4 with 6 speed start getting 30 and below.
-20f and colder we have to hold the clutch in or the truck will take off.
Sometimes it will kill the engine.
I have a little trouble shifting on cold mornings, but the way I feel it, it's not because the oil is too viscous...it is because the clutch isn't completly disengaging.
It's almost like the fluid in the clutch would contract enough to make the clutch inoperable.
I have a little trouble shifting on cold mornings, but the way I feel it, it's not because the oil is too viscous...it is because the clutch isn't completly disengaging.
It's almost like the fluid in the clutch would contract enough to make the clutch inoperable.
It will shift easier in cold temps with the ATF... in my view the draw backs are 1.The trans will be louder 2. The ATF dosn't have the gear shear qualities of oem fill.
This TSB is somewhat confusing I think. I have a 2004 F-250 with a ZF-6. The OEM oil is Mercon ATF. The owner's manual specifically says to use only Mercon ATF and NOT to use Mercon V ATF or Mercon SP ATF.
This TSB was released in Jan 2008.
M/T - Mercon(R) V ATF Usage Information
TSB 06-26-1
01/08/07
MERCON ATF IS BEING REPLACED BY MERCON V
AS A SERVICE FLUID FOR SOME MANUAL
TRANSMISSIONS FORD:
1981-2003 Escort
1984-1995 Thunderbird
1985-2007 Mustang
1985-1996 Bronco
1985-2007 Ranger
1986-1997 Aerostar
1991-2004 Explorer
1995-2007 F-150
1996-2007 F-Super Duty
2001-2003 Explorer Sport Trac, Explorer Sport LINCOLN:
2001-2002 Lincoln LS MERCURY:
1984-1995 Cougar
1987-1999 Tracer ISSUE
MERCON(R) Automatic Transmission Fluid is being replaced by MERCON(R) V as the service fluid for manual transmissions originally requiring MERCON(R). ACTION
Beginning immediately all manual transmission applications requiring MERCON(R) can now be serviced using MERCON(R) V or MERCON(R) Automatic Transmission Fluid or dual usage fluids labeled MERCON(R) / MERCON(R) V. After July 1, 2007, MERCON(R) Automatic Transmission Fluid will no longer be manufactured, therefore, availability of this fluid will continue until remaining inventory has been depleted.
An earlier TSB, in July 06, indicated that Mercon V was to be used in automatic transmissions originally requiring Mercon.
So it seems odd that 2008 models would not already have Mercon V in them. Unless they still filled some at the factory with Mercon, and now want them filled with Mercon V.
But to the OP. Your ZF-6 never had plain old gear oil in it. At the very least, it was factory filled with Mercon ATF.
The colder the oil, the higher the viscosity, the less friction between the synchro rings and the gears in a manual transmission. Makes a lot of sense.
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