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lt1 to ls1 t56

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Old Oct 11, 2006 | 07:57 PM
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Default lt1 to ls1 t56
I tried using search but couldnt come up with anything.

What is the difference between the lt1 and ls1 t56? I fould a good deal on a rebuilt lt1 t56 and was wondering what I will need and how much it will cost to get it to work on my 408 Ls1. What else will I need besides a new cluth and flywheel?
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Old Oct 11, 2006 | 08:09 PM
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you need to change out the input shaft and from cover. i am actually getting ready to do that to my LT1 style
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Old Oct 11, 2006 | 09:01 PM
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The slave cylinder setup is different as well
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Old Oct 11, 2006 | 09:03 PM
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i almost forgot too, didn;t the LS1 use a push clutch where as the LT1 used a pull clutch?
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Old Oct 12, 2006 | 01:16 AM
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About how much do you think it will cost? This is going into a 68 camaro so will having the correct slave cylinder even matter? \Sorry if this is a dumb question but I dont know a lot about the t56 or manual transmissions in general.
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Old Oct 12, 2006 | 07:17 AM
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what engine are you putting it behind?
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Old Oct 12, 2006 | 08:04 AM
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Originally Posted by AmericanMuscle313
About how much do you think it will cost? This is going into a 68 camaro so will having the correct slave cylinder even matter? \Sorry if this is a dumb question but I dont know a lot about the t56 or manual transmissions in general.
The input shaft is 170-200, and the front cover (bearing retainer) is around 100-120. Or maybe you can check some local tranny shops and find the parts used.
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Old Oct 12, 2006 | 10:10 AM
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First you have to be sure you have the LT1 that has the 2.66 first gears set. If not , you will not easily conver it to an LS1 application and you should start over. If it has a compatible set(2.66) you can swap the input ( be sure to check the bearing end play), bell and front adapter with the parts from an LS1 box. As far as the push vs pull goes and installing in a '68. You will have to decide what system you like best. For an LS1 engine, I would follow through with the push-style concentric hydraulic slave system that came in the 98+ Fcars.
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Old Oct 12, 2006 | 10:15 AM
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Originally Posted by 1981z28owner
what engine are you putting it behind?
I have a 408 Iron block ls1 with afr 225's, cam motion 239/242 611/612. 10.8:1 compression. Im hoping for 500rwhp. Its also set up for nitrous. I might go with a 250hp shot Direct Port.
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Old Oct 12, 2006 | 10:59 AM
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How to tell if the T-56 has the 2.66 first gear?

Thanks.
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Old Oct 12, 2006 | 11:51 AM
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Get the model # off the metal tag
1386-000-006= 3.36
1386-000-007=2.97
1386-000-009,016=2.66
1386-000-017,020=2.66(LS1)
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Old Oct 12, 2006 | 10:48 PM
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The guy is asking $950 for the fully rebuilt lt1 t56. Is it worth the money to try and make it work? Would that be a good deal ?
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Old Oct 13, 2006 | 06:46 AM
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Originally Posted by Stampede4ever
How to tell if the T-56 has the 2.66 first gear?

Thanks.
Almost every LT1 T56 has this ratio. the 2.97 and 3.36 first gear ratio was only used in 1993. So, if you T56 was made between 1994 and 2002, it has the 2.66 ratio. The input shaft will have 31 teeth. With the 2.97 ratio, it will have 29 teeth. Hope this helps!
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