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So should I use ATF or something else in my GT?

  • Thread starter Thread starter drag0nfan's04GT
  • Start date Start date Apr 14, 2006

drag0nfan's04GT

New Member
Sep 9, 2005
58
0
0
Sierra Vista, AZ
Apr 14, 2006
#1
  • Apr 14, 2006
  • #1
Well, I planned on changing the fluids this weekend in the manual tranny, as well as, the differential. I went up to the store and since the Royal Purple products are all behind the counter, the clerk bagged them up and I was on my way. I got home and realized that he'd given me ATF. I took it back and both guys at NAPA said that I should just use the same gear oil as the rear. Actually, they gave me the 75/90 instead of the 75/140. I came back to work, and after some light Stangnet reading, I'm now thinking that I should go back again and get the ATF again.

Has anyone heard of this, or is it just me? What weight is the ATF anyway? I'm just asking since I've read a 100 threads saying to put in ATF into the manual, but one or two that say uses a manual fluid. I would normally go with the majority on this one, but I had to ask if anyone has used 75/90 or any other rear end oil in the front. It''s all Royal Purple if that matters.
 
J

joekd

New Member
Dec 21, 2005
51
0
0
Apr 14, 2006
#2
  • Apr 14, 2006
  • #2
Napa is wrong, ATF (Mercon spec) is the correct fluid to use for your tranny
 

drag0nfan's04GT

New Member
Sep 9, 2005
58
0
0
Sierra Vista, AZ
Apr 14, 2006
#3
  • Apr 14, 2006
  • #3
Well, that's what I was thinking. After reading up on this for the last couple of hours. I have found that most everyone says to use ATF in these transmissions. I was planning on going with Royal Purple, since that's the oil I use and no one around here has any of the other top brands. Does anyone know the difference between the ATF and the Synchromax fluid that they sell?
 

40th GT

New Member
Apr 7, 2004
916
0
0
Lawrenceville, GA
Apr 14, 2006
#4
  • Apr 14, 2006
  • #4
ATF is the fluid recommended by Ford and Tremec. However, people get away with Synchromax and other manual trans fluids without problems.

I would go with what the manual recommends, just to help myself sleep better at night.
 

the98stang

Active Member
Aug 12, 2005
2,408
0
47
Clovis, CA
Apr 15, 2006
#5
  • Apr 15, 2006
  • #5
Use mobil 1 synthetic ATF. It's Mercon approved.
 
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