T 5 Fluid

mustangmutt · Apr 22, 2012

Can I run Mercon V in a T5 trans instead of Mercon III ?

pissedoff92 · Apr 22, 2012

I would imagine so. I could be wrong but didnt mercon V take the place of mercon III?

mustangmutt · Apr 22, 2012

Thanks pissedoff, I've done some reading on it and as far as I can tell it's not a problem to go from III to V. I'm installing a freshly rebuilt T-5 in my 90' and I ran out of Mercon III and have several quarts of the V on the shelf. I've always put in the III before. I forgot to ask the tech who rebuilt the tranny and I've always get good info here. I'm ready to fill it now, if the V messes up my tranny, I'm gonna be pissed off too.

pissedoff92 · Apr 23, 2012

I dont think it will. Im pretty sure thats what I put in mine it worked fine untill I wiped out 2nd gear

Gearbanger 101 · Apr 23, 2012

mustangmutt said:
Can I run Mercon V in a T5 trans instead of Mercon III ?

There's no such thing as Mercon III. There was Ford's Mercon, or Mercon V. And GM's Dextron III.

In any case, Mercon V is suposed to be backwards compatable with all tranmissions that ran the previous Mercon or Dextron III fluids although I would still personally only run one, or the other.

Killa · Apr 24, 2012

do not use mercon V, use the old dex/mercon ( advance auto part brand is perfectly fine ), back when I try find fluid for my T45 ( recomment mercon, I ask same question I can use mercon V, find out mercon V come out is support fix the shudder on automatic only. and do nothing to manual, and many having problem with mercon V on their old manual tranmission, I do run ole dex/mercon brand.

NIKwoaC · Apr 24, 2012

KillaGT said:
do not use mercon V, use the old dex/mercon ( advance auto part brand is perfectly fine ), back when I try find fluid for my T45 ( recomment mercon, I ask same question I can use mercon V, find out mercon V come out is support fix the shudder on automatic only. and do nothing to manual, and many having problem with mercon V on their old manual tranmission, I do run ole dex/mercon brand.

I had a pretty tough time reading that post, and I'm still not sure I understand it.

N8Dogg98 · Apr 24, 2012

Mix all three then you have nothing to worry about

Killa · Apr 24, 2012

NIKwoaC said:
I had a pretty tough time reading that post, and I'm still not sure I understand it.

What im saying is, dont use mercon V, just use regular dex/mercon and I recomment advance auto part brand dex/mercon.

Saiboot · Apr 24, 2012

Stick with Dexron III/Mercon (regular ATF), it's been used in T5s for years with no problems (including my own). Mercon V would supposedly affect the blocking rings on the synchros in a weird way, but there's not much official documentation on this. Many people have used Mercon V and other sythentic fluids and said they have no problems, but for the price of 3 quarts of the regular stuff, might as well use something that Ford trusted in the first place.

Killa · Apr 24, 2012

Saiboot said:
Stick with Dexron III/Mercon (regular ATF), it's been used in T5s for years with no problems (including my own). Mercon V would supposedly affect the blocking rings on the synchros in a weird way, but there's not much official documentation on this. Many people have used Mercon V and other sythentic fluids and said they have no problems, but for the price of 3 quarts of the regular stuff, might as well use something that Ford trusted in the first place.

Yes this is what im try to say, mercon V is come out just for the automatic shudder problem ford having, its not made for older manual tranmission.

88LX5.Oh · Apr 24, 2012

I run engine oil in mine because I'm freaking awesome.

Vertistang93 · Apr 24, 2012

I'm pretty sure I would just trust Ford. The above poster is correct though, Ford came out with Mercon V for the hated "shudder" which worked really well for my Crown Vic's and Grand Marquis. I think it will work just fine in your T5. That's what I have in mine. I even changed the fluid in my power steering over to it, and it sure made it a lot quieter.

mustangmutt · May 13, 2012

Thanks for the replies guys. I went with the Mercon V. The only problem I had was the defective second gear that broke under no load at all. Then I found out the supplier of the supplier that I got my gears from said they have recieved over 200 defective 2nd gears. I found a second gear that was "cyrogenically" treated and guaranteed not to fail. So far so good. I also replaced third gear and it is okay.

SVT32VDOHC · May 15, 2012

I wouldn't waste money on new style fluid for old technology. I had to buy V for my 06 Explorer when a trans line took a dump and it was $84.99 a case. I luckly got to return 4 quarts, but man what a rip off.

T 5 Fluid

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