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Old 05-23-2014, 12:37 PM   #1
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Tremec T56 trans

Started gathering parts for my manual swap, bougth a SRT10 T56 locally that came out of a viper truck wich was involved in a side collision. First thing I want to do is to confirm that the mainshaft is not bent (tailhousing was damaged), on to the questions :-)

- what is the allowed 'out of straigthness' of the actual mainshaft? (not side play in the bearings)

- is it possible to measure the main shaft straightness in with the shaft still in the transmission? Or does it need to be disassembled and the shaft measured using v blocks? I'm thinking bearing play could lead to false measurements?

- I did a quick measurement on a machined surface where there normally sits a bearing and on an unmachined part of the main shaft. Machined part had 0.001"/0.04 play, unmachined part had 0.01/0.4mm play. Am wondering if the shaft is out of round or maybe the difference in measurements is the fabrication tolerance difference on the machined and not machined part?

Measuring the machined part:



Not machined part of the shaft:


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Old 05-23-2014, 12:45 PM   #2
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I would have to say that's within tolerance your talking thinner than a piece of hair there doesn't get much smoother
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Old 05-23-2014, 09:37 PM   #3
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I like your decision to go with a manual Is that T56 stronger than the G56 that came in some 2500 and 3500 trucks? My 2006 has the G56 behind the HEMI and I was told not to add much power to it because the shafts will walk and break the case. I'm just curious if this might be a solution for my future crazy thoughts....
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Old 05-23-2014, 10:06 PM   #4
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The g56 ratio is no good and it cannot take much power over stock at all
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Old 05-23-2014, 11:28 PM   #5
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Quote:
Originally Posted by MANual_puller View Post
I like your decision to go with a manual Is that T56 stronger than the G56 that came in some 2500 and 3500 trucks? My 2006 has the G56 behind the HEMI and I was told not to add much power to it because the shafts will walk and break the case. I'm just curious if this might be a solution for my future crazy thoughts....
It's the same transmission as in the srt10 500 hp dodge ram truck, the normal viper car, mustangs, chevy's, aston martin,... plus the truck transmission has some stronger internals due to the truck being heavier than a normal car. Don't know exactly what parts though, but upgrading to truck internals is a mod for the car transmissions. Lot's of info to be found on the internet. Manufacturer is Tremec, transmission type is T56. They have a new model out now which is called the T56 magnum.

There is a thread on one of the other forums where one of the fastest ram trucks is running a T56, don't know if the owner is also on this forum. Sharadon did the install if I'm not mistaken.
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Old 05-24-2014, 01:39 AM   #6
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Had another look this morning with a fresh mind, and came to the conclusion that the last part of the main shaft is bent. It has more than 0.07"/2mm deflection in the last 3 to 4 inches of the shaft :-(, bummer but lessen learned I guess. Even without the micrometer I can see the deflection when I turn the shaft.

Click to play
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Old 05-24-2014, 08:19 AM   #7
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That's not the truest of edges is there anything you can put around that shaft like a yoke or something really
Smooth to test that. It's hard to bend that end of the transmission IMO
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Old 05-24-2014, 11:58 AM   #8
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I would think a u-joint would let go before a shaft would bend.
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Old 05-24-2014, 01:00 PM   #9
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If the shaft is suspected of being bent then it'll need to be replaced, meaning it will need to be removed and stripped. At that point you can mount it on it's centers and definitely tell if it is within tolerance or not. So practically speaking you have nothing to lose by stripping down the trans. I would measure it on the bearing surfaces anyway. Good luck with another great mod.
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Old 05-24-2014, 02:11 PM   #10
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Quote:
Originally Posted by charged392 View Post
The g56 ratio is no good and it cannot take much power over stock at all
That's what I've been told. It's the same transmission they're still using behind the Cummins and they put out 800 lbs of torque so it should be able to take a little abuse. Idk though, makes me kind of leery about modding. I did find a company that makes an external girdle that is supposed to help but is still far from a solution.
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