My dad just changed my tanny fluid.Advanced recommends mercon v, but dad said mercon/dexron lll was ok.Tranny is now winding out, not shifting as quickly.Am i paranoid? Is this fluid ok?

Dextron/Mercon is being 'replaced' with MerconV.. Here's a portion of the TSB in regards to the change..

TSB
06-14-4[/align]
MERCON ATF IS BEING REPLACED BY MERCON V ATF AS A SERVICE FLUID.
[/align]n Date: June 29, 2006

FORD:[/align]
1980-1997 Crown Victoria
1981-1997 Mustang, Thunderbird
1981-2003 Escort
1986-1993 Festiva
1986-1997 Taurus
1989-1997 Probe
1994-1997 Aspire
1995-2000 Contour
1980-1996 Bronco
1981-2003 F-150
1981-2004 E-Series, F-Super Duty
1983-1996 Ranger
1986-1996 Aerostar
1991-1997 Explorer
1993-2004 F-53 Motorhome Chassis
1995-1998 Windstar
1997-2004 Expedition
2000-2005 Excursion
2001-2007 Escape
1987-2000 F- & B-Series
2000-2007 F-650, F-750


LINCOLN:[/align]
1980-1997 Town Car
1981-1997 Continental
1993-1997 Mark VIII
1998-2004 Navigator
2002-2003 Blackwood


MERCURY:[/align]
1980-1997 Grand Marquis
1981-1997 Cougar
1986-1997 Sable
1987-1999 Tracer
1995-2000 Mystique
1999-2002 Cougar
1993-2002 Villager
1997 Mountaineer
2005-2007 Mariner


MERKUR:[/align]
1985-1989 XR4TI

This article supersedes TSB 01-15-7 to update the vehicle application chart.
ISSUE:[/u]
MERCON® Automatic Transmission Fluid is being replaced by MERCON® V as a service fluid.
ACTION:[/u]
Beginning immediately all automatic transmission / transaxle applications requiring MERCON® can now be serviced using MERCON® V or MERCON® Automatic Transmission Fluid or dual usage fluids labeled MERCON® / MERCON® V. After July 1, 2007, MERCON® Automatic Transmission Fluid will no longer be manufactured, therefore, availability of this fluid will only continue for however long it takes to deplete what remains in inventory.

Thanks for posting that TSB, Hayapower! It applies to my Taurus also, so it's something that's good for me to know too.

Bronco, sometimes it can be good to have a little paranoia.Nissan recommends DexronIII Automatic Transmission Fluid(ATF) for the power steering on my all of my Z's. I've had to replace two steering racks within 1 year on the same car because the certified mechanics didn't even know this, and had been using power steeringfluid (not ATF), which damaged the seals and caused my racks to leak. So, it's always better to ask questions to be safe, rather than sorry later. ;)

Thanks for your post, I keep an eye on that too...