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T-56 Dexron III

Old 11-30-2009, 10:15 PM
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Default T-56 Dexron III

What fluid are you guys using in your T-56s?

I know they dont make Dexron III anymore. so I wonder what is the best CHoice to use..

I havent used this, but is Dexron VI ok to use??

I dont want no answers like " yes, it exceeds Dexron III, so it myst be fine"..

because when they made Dexron VI, they probably had Auto transmissions in mind..

I wonder what was the last year they made T-56s and what they still used.. Like what does the CTS-V use? but then again, I dont think they're running T-56s anymore, either..

Does anyone know whats the Best ATF to use in a Built T-56??
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Old 11-30-2009, 10:31 PM
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Im a manager at a auto parts store and they still do make dextron III. lets just say you go to NAPA and pick up a few quarts of part #75-200 or you can pick it up at any auto parts store.
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Old 11-30-2009, 10:36 PM
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Originally Posted by cabotgsxr View Post
Im a manager at a auto parts store and they still do make dextron III. lets just say you go to NAPA and pick up a few quarts of part #75-200 or you can pick it up at any auto parts store.
I was at Pep Boys and they said they didnt have any...

Thanks for the help..

But I am still curious if we can run any other ATF in our cars, if they say they exceed Dexron III...

etc..
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Old 11-30-2009, 10:44 PM
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I haven't done any research, but I next time I need a tranny fill for the T56 it will be with Dexron IV.

The reason it's called Dexron is to assure people that it's backwards compatible. Otherwise a new oil would be called something else.

I can't imagine D4 has omitted anything that D3 had. Or that D4 has added anything harmful that D3 did not have.

This is the logic I'm going with even though I don't know **** about it.
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Old 11-30-2009, 11:44 PM
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If I'm not mistaken..Dex IV is Full Synthetic..that is what I've been hearing from a few people.
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Old 11-30-2009, 11:46 PM
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Originally Posted by the_merv View Post
If I'm not mistaken..Dex IV is Full Synthetic..that is what I've been hearing from a few people.
that is correct!
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Old 11-30-2009, 11:52 PM
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I knew it..
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Old 11-30-2009, 11:54 PM
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dex IV is backwards compatible with III but im not sure if its full syn,if so i wouldnt use it if your t56 is equipped with the paper blocker rings,only use with carbon fiber rings.
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Old 12-01-2009, 12:12 AM
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use syncromesh it was a big improvement over dex III for me much much smoother
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Old 12-01-2009, 01:45 AM
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Originally Posted by ae13291 View Post
use syncromesh it was a big improvement over dex III for me much much smoother
I dont know if I heard this correctly, but from what I remember, Synchromesh was giving issues...
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Old 12-01-2009, 01:48 AM
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Originally Posted by 99huggerorangeZ View Post
dex IV is backwards compatible with III but im not sure if its full syn,if so i wouldnt use it if your t56 is equipped with the paper blocker rings,only use with carbon fiber rings.
I had carbon blocker rings when I rebuilt the T56.. But the paper and carbon blocker rings look very similar, if not identical from physical appearance, at least thats how they looked after ATF was covering them..
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Old 12-01-2009, 01:49 AM
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Ahh so anyways, I ended up with Pennzoil DexIII compatible ATF..

Im gonna need to rebuild the T56, again soon, so I guess Ill use that (unless it sucks or something)... Anyways, where are you guys buying your rebuild kits these days...
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Old 12-01-2009, 02:03 AM
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Originally Posted by LSGunZ28 View Post
I dont know if I heard this correctly, but from what I remember, Synchromesh was giving issues...
thats the royal purple stuff. the one i bought is pennzoil the same oil GM uses, theres is rebadged pennzoil as well. it really made my car shift smooth. i went from mobil 1 dex III to regular dex III (it was actaully smoother then full syn) then syncromesh about $10 a quart and this made a very big differance especially in the mornings
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Old 12-01-2009, 03:49 AM
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Originally Posted by ae13291 View Post
thats the royal purple stuff. the one i bought is pennzoil the same oil GM uses, theres is rebadged pennzoil as well. it really made my car shift smooth. i went from mobil 1 dex III to regular dex III (it was actaully smoother then full syn) then syncromesh about $10 a quart and this made a very big differance especially in the mornings
Yes I think you are right.. It was the royal purple that sucked..

Thanks..

So Pennzoil should be alright..

Cool, thanks
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Old 12-01-2009, 08:45 AM
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Originally Posted by LSGunZ28 View Post
I had carbon blocker rings when I rebuilt the T56.. But the paper and carbon blocker rings look very similar, if not identical from physical appearance, at least thats how they looked after ATF was covering them..
I don't know what kind you used but every one of the CF Synchros that I have seen look very different from the stock paper ones.
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Old 12-01-2009, 11:36 AM
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I know that DEX VI is not recomended for t56 trans. Stick with dex III, Mobile 1 synthetic ATF or I have used AMS oil syncromesh
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Old 12-01-2009, 01:31 PM
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Originally Posted by dschmittie1 View Post
I know that DEX VI is not recomended for t56 trans. Stick with dex III, Mobile 1 synthetic ATF or I have used AMS oil syncromesh
... and now this comment, deters me from Dex VI

where did you hear this?
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Old 12-01-2009, 01:33 PM
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Originally Posted by the_merv View Post
I don't know what kind you used but every one of the CF Synchros that I have seen look very different from the stock paper ones.
I got mine from T-56 rebuilds (now theyve been called six speeds inc)..

They look like a flat charcoal colour. (the carbon ones)..

The "paper" ones looked very similar to me. (unless my trans had been rebuilt before?) But I doubt that, I bought the car at 56k miles, at a dealer and no history of rebuilt trans.. Besides, everything else in the T-56 looked stock..
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Old 12-01-2009, 01:40 PM
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Originally Posted by LSGunZ28 View Post
... and now this comment, deters me from Dex VI

where did you hear this?
It was in some literature from Tremic. Saying that Dex VI was not recomended for the t56. Also GM calls for dex III or there special man. trans fuild.
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Old 12-01-2009, 01:57 PM
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Originally Posted by dschmittie1 View Post
It was in some literature from Tremic. Saying that Dex VI was not recomended for the t56. Also GM calls for dex III or there special man. trans fuild.

I wanna know what type of fluid people are running in their 700+rwhp capable T-56s...

Dex III is fine, but is there a better Dex III out there for a more race built T-56?

The car is a D.D. although these days its not seeing as much mileage as it used to...
The car gets drag raced, but also occasional road racing as well..

Car makes near 500rwhp now and maybe a bit more in the near future..

I expect the car to maybe make 700+RWHP in the future...
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