What is the best fluid for a T5 Transmission - Ford Mustang Forum
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post #1 of 29 (permalink) Old 11-21-2011 Thread Starter
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What is the best fluid for a T5 Transmission

Hello, I have a 1993 mustang lx 5.0 and I am going to change the fluid in the T5 manual transmission. Is there any special fluid I need to use or additives?

Also does anyone know the best brand to use ex. Amsoil, Mobil One ect....

Any advice would be appreciated.

Thanks - Brian
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post #2 of 29 (permalink) Old 11-21-2011
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I'm sure Royal Purple makes something that is probably considered by most to be the best. I use Valoline synthetic fluid in my T5s and it has never failed me. T5s like yours (and mine) use Dexron III/Mercon ATF, not gear oil

'94 Laser red 'vert. Still a 5-oh... for now
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post #3 of 29 (permalink) Old 11-22-2011
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Dex / Merc
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post #4 of 29 (permalink) Old 11-22-2011
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I think you have your answer.

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post #5 of 29 (permalink) Old 11-22-2011
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i asked this question a while back cause i knew the T5 required DEX/MECON III and i wanted the best stuff. my choices was royal purple gear oil, royal purple syncromesh, royal purple ATF or just the regular dextron/mercon III.

i called royal purple's tech line and found out that the best thing to use would be the RP syncromesh.

1995 Mustang Cobra, 5.0 V8, T5 transmission

*currently under restoration*

could you repeat all of that, I wasn't listening???
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post #6 of 29 (permalink) Old 11-22-2011
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Quote:
Originally Posted by PANTYEATR View Post
found out that the best thing to use would be the RP syncromesh.
That's what I put in mine, shifts smooth..

Royal Purple Manual Transmission Fluid

89 LX Vert 5.0 Mostly Stock
5 speed,
2.73, TracLok still blown, but, new Spec Stg 1 Clutch
Dynomax Super Turbo
s[I]

I'm a victim of circumstance..


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post #7 of 29 (permalink) Old 11-22-2011
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So how often should you do this? I've had my car about 2 years now but don't know when it was done last. I'm not having any issues, just wondering.

.....and I did use the search feature but couldn't find this answer!! :tongue

Thanks for the above info though!!
Also found this good info....
http://www.allfordmustangs.com/forums/5-0l-tech/159097-t5-oil-change.html

'93 LX 5.0L Hatchback T5
- MM SFC's/MM LCA's/UPR UCA's/3.55 FRPP gears/UPR Torquebox/Aluminum DS/Spec Stage 1
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- MAC shorties/Flowmaster 40's & tails/Gabriel shocks & struts/Chrome Ponies
- Autometer gauges/04 Cobra seats/Pioneer sound/Satellite Radio/Billet thingys
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post #8 of 29 (permalink) Old 11-26-2011 Thread Starter
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I was on this website
Modern Driveline - T5 History in Ford Mustangs with specifications for World class and non-World class T5's

This is what it said


One last piece of important information. ALL World Class T-5 use ATF (Dextron III) oil and NOT heavy gear oil or Redline MTL! All NON-World Class T-5 use 50 wt gear oil. (The original Ford/Borg-Warner recommendation back in 1984 was Dextron II. As this is no longer available, we and TREMEC recommend the 50 wt gear oil.) We recommend high quality Synthetic oil as it lasts a long time and over a larger operating temperature. It is important to change the oil in your transmission based on how you use the vehicle. If the vehicle is your daily driver then changing the oil every two to three years is fine. However, if the transmission sees regular track duty and pushed hard, then once or twice a year is in order. When we rebuild transmissions, we can tell when the oil has been changed often as the parts are much cleaner with less over all wear. There is no filter inside the manual transmission only a magnet at the bottom to pick up the metallic particles in the oil, the only metallic parts in a transmission is the gears or bearings. Oil is cheap, transmissions are not!

my question is which trans do I have
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post #9 of 29 (permalink) Old 11-27-2011
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1993? World Class T5.

'94 Laser red 'vert. Still a 5-oh... for now
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Quote:
All NON-World Class T-5 use 50 wt gear oil. (The original Ford/Borg-Warner recommendation back in 1984 was Dextron II. As this is no longer available, we and TREMEC recommend the 50 wt gear oil.)
Bad advice.

Dexron III ATF replaced Dexron II ATF.

Mercon ATF replaced Dexron III ATF.

Mercon V ATF replaced Mercon ATF.
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Brian,
Definitely, 100%, no doubt, go with the ATF as specified by Ford and Borg-Warner. And no additives.

I haven't seen it yet in this thread, but it never fails, someone will chime in and say "it's a gear box, you gotta put gear lube in it". NO. The World Class T5 was engineered to use ATF, so whatever brand you choose, use ATF. Don't let anyone out there think they know more than the engineers who designed this transmission. As an engineer who designs consumer products, let me just tell you it's just silly when people assume they know more about the transmission than the guy who engineered it.

That being said, the T5 it only takes a couple quarts, and it's not like you change it every day, so spend a few extra bucks and buy the best synthetic ATF you can find. Which is best in this application is largely based on opinion, but I've tried Amsoil and I've also run conventional non-synthetic ATF. I've never had a lubrication-related problem. Let's be honest, most T5's that do fail will break, not wear out. I'm on my third T5 and it's not because I'm a high-school powershifter, or that I don't know how to drive stick. I've been driving stick shift for 30 years. The sad truth is, this transmission was rated by Borg-Warner (now Tremec) for 280 lb-ft of torque... while the 5.0 in the 1987-up Mustangs was rated at 300 lb-ft. And that's before any modifications, of which most of us have done at least a few. So if driven enthusiastically, your T5 may eventually break; and there's nothing any synthetic or magic additives will do to prevent that.

If you want it to last forever, drive like a grown-up, don't powershift, don't put a set of cheater slicks on and go hit your local drag strip, and for cheap insurance, change the ATF in it once a year. On the other hand if you're willing to replace it every now and then, put in any name-brand ATF, drive it like your life depends on winning every stoplight-challenge, and have fun!
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whats the best way to tell between a non-world class and a world class
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ID tag bolted to or near top cover
VIN stamped into passenger-side of case
bolt head type of reverse/5th gear pivot on driver-side of case
bearing brand/type in front of case (inside bellhousing)

Those are all ways to ID a standard duty (non-WC) and a heavy duty (WC) T-5.
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post #14 of 29 (permalink) Old 05-09-2012 Thread Starter
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T5 Fluid change

Well after surching through the internet for answers on the subject, I went ahead and changed my fluid in the T5 to pinsoil synchromesh. And if you are searching high and low for some answers you just got one. This is by far the best fluid I have ever used it is the consistency of watered down gear oil and boy what a difference in the shift quality. Is is so smooth it feels like a new tranny, seriously its that good.

Sorry ATF you do not belong in a manual transmission.
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FYI- This Pennzoil fluid is 75W90, that's all.
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