Manual Transmission T56 | T5 | MN12 | Clutches | Hydraulics | Shifters

T56 - Quarts

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Old Oct 1, 2008 | 04:39 PM
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Default T56 - Quarts

I have the T56 Tranny. And it's grinding alot into reverse and is having trouble getting into the gears. I was going to change the oil before anything else. How many quarts do the T56's use? I use ATF Dextron with the Mercon additive. So I wanted to know how many quarts and how much of the additive. Also Any advice on what to do with this problem thanks.
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Old Oct 1, 2008 | 05:50 PM
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It takes 3 1/2 to 4 quarts of oil. Didn't add any additive to mine. Looking at the power in sig I would say you need to call sixspeed inc or I believe they go under LMR now.
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Old Oct 1, 2008 | 06:01 PM
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Yeah, it takes just under 4 quarts if you fill it through the fill plug. Last time I did mine I just poured it through the shifter.

Also, bleed your hydraulics if you're having trouble getting it into gear.
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Old Oct 2, 2008 | 06:38 AM
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I would like to know the Mercon additive you mention. Is it a friction modifier? Is it the stuff that is also put in rear ends? If so- that could cause a shift problem in a T56. How was it you went down the additive road?
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Old Oct 2, 2008 | 12:38 PM
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It holds 4 quarts and pouring it in through the shifter is the easiest way to refill it. Just regular automatic trans fluid, dexron mercron III is the standard fill, there is no "additive". I use Pennzoil Synchromesh though, and like it alot.

To be honest with you, and your not gonna want to hear this, but changing the fluid isn't going to solve the issues your having. Sounds like it's time for a rebuild.
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Old Oct 3, 2008 | 01:35 AM
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Well thanks for the help again. I love the site, lots of help here! And I'm already thinking on the rebuild. I live in a SMALL town in Texas..and does Six Speed Inc. just send the rebuild kits, or will they do it? How and such??
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Old Oct 3, 2008 | 01:40 AM
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Yeah i don't know much about the additive. I had just bought the car like 3 months back. The whole car was done good! I have had no problems, it's just now I see they never did the Tranny. But I'm still not complaining, it was a hell of a deal. Just should have though about the T56's not holding that much power stock ha.
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Old Oct 3, 2008 | 02:59 AM
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use honda ATF its way better than that dextron ****... Honestly though its good
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Old Oct 3, 2008 | 12:08 PM
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They are from Houston and I think around a thousand or so is the price for a decent upgrade and if I am not mistaken they have went in with or sold to LMR. They are both sponsors on here.
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Old Oct 3, 2008 | 01:11 PM
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The symptoms your having have nothing to do with power output. The stock T-56 can handle a good amount of power. What happens first with these trannys can happen with only bolt-ons, or even while bone stock. The aluminum 3-4 shift fork get's tweaked, the slider keys are stamped and therefore get mangled, the fork pads are plastic, and when the clutch and hydraulics aren't up to par anymore from wear, the syncronizers take the abuse cause the clutch is no longer fully dis-engaging.

Last edited by BriancWS6; Oct 9, 2008 at 12:39 AM.
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Old Oct 3, 2008 | 04:41 PM
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That sounds exactly like mine Brian. I want a great upgrade cause i wanted to go to the track and have no excuses haha. I'll be looking at them, especially since they're from Houston. Thanks!
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Old Oct 4, 2008 | 05:34 PM
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im pretty sure that dextron 3 w/mercon means the additive is already mixed in
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Old Oct 8, 2008 | 02:18 PM
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Originally Posted by BriancWS6
The aluminum 2-3 shift fork get's tweaked,
2-3 fork...

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Old Oct 8, 2008 | 02:33 PM
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Originally Posted by SSickLS1
im pretty sure that dextron 3 w/mercon means the additive is already mixed in
I'm pretty sure you don't know what you're talking about.

Mercon isn't an additive, it's a specification used by Ford.
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Old Oct 9, 2008 | 12:38 AM
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Originally Posted by crainholio
2-3 fork...

Excuse my brain fart. 3-4 shift fork.
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Old Oct 9, 2008 | 07:48 AM
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When it's just 1 or 2 individual gears, instinct says transmission internals, if it's all gears acting up the same way, possible clutch/hydraulic issue. Reverse and 1st would act up the worst as most of the time you are putting it into gear from a stop at that point. The others would act up and grind.

Check the hydraulic fluid first, give it a good bleed, you just may be fortunate that it's cooked fluid.
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