tremec t5 transmission - Ford Mustang Forum

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post #1 of 39 (permalink) Old 11-12-2009 Thread Starter
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tremec t5 transmission

What type of oil should i use in my transmission?

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post #2 of 39 (permalink) Old 11-12-2009
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that depends if it world class or non world class. World class uses automatic fluid i belive dex 3. Non world class uses a gear oil


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post #3 of 39 (permalink) Old 11-13-2009 Thread Starter
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how could i figure out if it is a world class or not?
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post #4 of 39 (permalink) Old 11-14-2009
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Go to the official Tremec website, and they can tell you by the numbers stamped on your trans. If it's a new transmission, most likely its going to be non-synthetic ATF fluid. Thats what goes in the H.D. Tremec T-5 I bought from Jegs last year. Theres is a guy on here that works for Tremec, I think hes a moderator. Ask one of the mods I'm sure they know him.

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post #5 of 39 (permalink) Old 11-14-2009
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86 and up is a world class in a v8 car if its the factory trans.. in most cases

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post #6 of 39 (permalink) Old 11-14-2009
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Some cars can have the Borg-Warner T5 as well, they also use the ATF in the case.

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post #7 of 39 (permalink) Old 11-15-2009
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World Class or not, they both require auto transmission fluid. I wish we would dispell for good this idea that the non-WC T-5s use gear oil. The transmission manufacturer (Borg Warner -'98, TREMEC/TTC '98+) says to go by the vehicle manufacturer's specs. The vehicle manufacturer (Ford) says to use Dexron/Mercon.

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post #8 of 39 (permalink) Old 11-16-2009 Thread Starter
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yeah but my transmission didn't come with the car, anyways i'll just put in the numbers and figure out thanks everyone
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post #9 of 39 (permalink) Old 11-16-2009
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Quote:
Originally Posted by Comegetsome5o View Post
yeah but my transmission didn't come with the car, anyways i'll just put in the numbers and figure out thanks everyone
If there is a metal tag on one of the tail housing bolts, look for a number that says "13 52 xxx" the last three digits of the xxx will identify the transmission vintage and gears inside.

If there is no tag, look at the casting number on the main case near the reverse light switch.

If it reads 13-52-065-904 or lower, it is NON-World Class and uses gear oil.

If it reads 13-52-065-908 or higher, it is an 85 or newer T5 and is World Class and uses Dexron-III ATF, or equivalent.

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Quote:
Originally Posted by FoxChassis View Post
World Class or not, they both require auto transmission fluid. I wish we would dispell for good this idea that the non-WC T-5s use gear oil. The transmission manufacturer (Borg Warner -'98, TREMEC/TTC '98+) says to go by the vehicle manufacturer's specs. The vehicle manufacturer (Ford) says to use Dexron/Mercon.
Please post a photo of the page in an 84 or older owner's manual that says the manual transmission uses ATF. We might begin to believe you then...

EVERY SINGLE non-World Class T5 I have torn down had gear oil in it...

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Quote:
Originally Posted by SPeace-ATL
Please post a photo of the page in an 84 or older owner's manual that says the manual transmission uses ATF. We might begin to believe you then...

EVERY SINGLE non-World Class T5 I have torn down had gear oil in it...
The 1983 and 1984 Ford Shop Manuals....
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Quote:
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The 1983 and 1984 Ford Shop Manuals....
That is very interesting! It says Dexron-II I think. It is hard to make out. Is there a publication date on those manuals?

I'm still curious what Ford put in the owner's manuals. Does anyone here have an owner's manual for an 83, or 84 Mustang that they can check for the recommended lubricant for the manual transmission?

The account we hear most is that Borg Warner changed the fluid to ATF because gear oil was not able to properly penetrate the small, caged, needle bearings that were introduced with the 85 World Class models.

Is it possible that they used gear oil through 84, but then when they realized they needed ATF, they made the change retroactive? That would be smart for them to do so that there would be only one type of fluid in a T5 and, in theory, less confusion.

The ATF would work in both types, but the gear oil is supposedly too thick for the caged needle bearings in the World Class units.

I have never drained ATF from an 84 or older T5...

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Quote:
Originally Posted by 30 sick View Post
86 and up is a world class in a v8 car if its the factory trans.. in most cases
WRONG, the 2.95 1st gear World Class did NOT come factory stock for 86 and up V8's! They came with the standard 3.35 1st gear T-5! And I always used amsoil synthetic ATF in my T-5 against the advice of some saying it would tear down the paper synchros but I can attest that this particular Tranny is STILL working perfectly in that 89GT, I sold it almost 4 years ago with 220K miles on it and it was a dragstrip warrior for a decade running full slicks and a Big Nitrous jet! It's the original T-5 that came with the car!!

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Quote:
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WRONG, the 2.95 1st gear World Class did NOT come factory stock for 86 and up V8's! They came with the standard 3.35 1st gear T-5!
I re-read the thread above and nobody said anything about 86 and up having 2.95 first gear T5s. You are coorect that all factory stock V8 (and V6) Ford T5s made from model Year 1985 and newer have 3.35 for the first gear, but they are also all World Class T5s because they have the improved needle bearings under gears 1,2, & 3, the non-brass synchronizers for 1-4, and the improved countergear bearings. I also prefer Amsoil ATF for world Class T5s.

Many of the stock V8 T5s prior to 1985 have the 2.95 first gear, but are not World Class.

The World Class units that have the 2.95 first gear are all aftermarket, or Ford Racing/Motorsport units. The newer ones are marked M-7003-Z on the tag. Those units have the COBRA style tapered, caged roller bearing on the end of the input shaft. These are the ones referred to as "Z-Spec" T5s and are the strongest produced by Borg Warner/Tremec.

(Astro A5 and G-Force are stronger yet, but are modified T5s and not production units.)

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Quote:
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That is very interesting! It says Dexron-II I think. It is hard to make out. Is there a publication date on those manuals?
The 1983 manual, dated April 1983, says the lubricant type is "Dexron II".
The 1984 manual, dated September 1983, says the lubricant type is "Dexron II Series D".

The 1983 manual is dated after the first half of the '83 model year because it cover items/systems that weren't available in Mustang/Capri production models until after the model year started....

T5OD (T-5) = after first ¼ of '83 MY (early December '82)
convertible = middle-to-late '83 MY
turbo = late '83 MY

The 1984 manual is dated for the beginning of '84 MY.

Quote:
Originally Posted by SPeace-ATL
I'm still curious what Ford put in the owner's manuals. Does anyone here have an owner's manual for an 83, or 84 Mustang that they can check for the recommended lubricant for the manual transmission?
Attached to this post are images from my '83 Owner Guide; one of the front cover, one of fluid capacities, and one of lubricant specs. It was printed in November 1982, which was before the T-5 was available in production models.

The Owner Guide and the 1983 Car Shop Manual (the original "Powertrain" manual printed September 1982, not the "Supplement" manual I posted previously) has a "five-speed overdrive" manual transmission that is NOT the T-5.

SO........any '83 Owner Guide that you want to see specs specifically for the T-5 is going to have to be printed after the T-5 was available in production models, which means after November 1982, and it must specify which "manual" transmission it is listing specs for, as there were FOUR manual transmissions available in the '83 Mustang after December 1982; two four-speeds (FIG and SROD) and two five-speeds ([unknown name] and T5).

I can't speak for the '84 MY Owner Guide(s) as I do not have any.

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