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LT1 T56 to an LS1?

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Old Sep 6, 2012 | 05:03 PM
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Default LT1 T56 to an LS1?

Ok, I did a little searching but am still a little confused on this.

After figuring out today that the T56 I purchased with my LS1 (out of a 2004 GTO) is from a 94-95 Firebird/Camaro I am pretty frustrated.

I have read that the LT1 t56 has a shorter input shaft because of the different hydraulic set up for the clutch and so you cannot use the LT1 t56 with an LS1 without changing more stuff than is worth it.

However, if I go ahead and use the LT1 style hydraulics (standard TOB instead of the LS1 hydraulic TOB) can I use this trans with my LS1? I put my clutch disk onto the input shaft and the splines are a perfect match.
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Old Sep 6, 2012 | 05:53 PM
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no.. I'm in the middle of this myself. the problem is the crank on a ls1 is shorter then a lt1 so the input shaft of a lt1 t56 wont "reach" the ls1 crank. Only way to run that tranny with a ls1 is to change the input shaft, front plate and bellhousing


also make sure that the tranny is from a 94-95 cause a 93 can't be converted to a ls1 t56
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Old Sep 6, 2012 | 06:51 PM
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I looked up the part number and mine is from a 94/95. I would much rather just sell this and buy a t56 that will bolt right up to my motor but I cant post in the classifieds because of the stupid 50 post rule! ARGH

Any ideas on a good place to find the parts I would need to covert it?
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Old Sep 6, 2012 | 07:37 PM
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Very seldomly everyone agrees on a subject, but you found it. Just sell the LT1, buy an LS1 trans. Btw, do a little more research, the GTO flywheel, clutch, bellhousing, shifter, and starter are specific to the GTO.
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Old Sep 7, 2012 | 11:48 AM
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Are you sure I can't use a standard LS1 trans with my motor? That would make things a lot easier since the parts are a lot easier to come by. The drivetrain is NOT going in a GTO.

Also any other forums that would be good to sell my current t56?
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Old Sep 7, 2012 | 01:26 PM
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The LS motor is the same. But I'm pretty sure you'll need a non GTO (F body, corvette, truck) starter, flywheel, clutch, bellhousing to work with an F body T56.
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Old Sep 7, 2012 | 01:51 PM
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Ok great. I already have a monster stage 3 clutch/flywheel that is for an fbody and do not have a starter or bellhousing at all yet. I will look for an fbody trans and then buy the body starter. That should be the least expensive rout right? And the difference in shifter position is just 4in so that should be easy to compensate for either way.
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Old Sep 7, 2012 | 02:59 PM
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Where are you located? What would you want for the LT T56?
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Old Sep 7, 2012 | 03:13 PM
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Im in Washington near Seattle. I posted it on CL for $1000obo

Its in great shape and has the bell housing, shifter/assembly, clutch fork and a new throw out bearing. Shifts through the gears great and appears to have all the external plugs/wires

Feel free to text me at 206-321-7998
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Old Sep 7, 2012 | 03:14 PM
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or I would love to trade it for an fbody t56!
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Old Sep 7, 2012 | 03:40 PM
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OK well your a little to far from me, I thought if you were close enough I could pick it up as a spare.
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Old Sep 7, 2012 | 04:24 PM
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I dont mind shipping it.
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