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Old 10-10-2009, 09:00 PM   #1
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Default Need T56 input shaft end play/preload setting.

I will soon be changing the mid-plate and input shaft in my LT1 T56 to the LS input and mid-plate. I've been searching but can't find the end play and preload settings for the LS input shaft. I want to make sure I have the preload and bearing shimmed properly. Any help is greatly appreciated.
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Old 10-11-2009, 01:55 PM   #2
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Stock values are in the Service Manual (pg43):

http://www.ttcautomotive.com/English...610-0199_2.pdf

I usually add 0.002-0.003 additional shim to the stock values to keep things tight as the aluminum case expands under heat.
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Old 10-11-2009, 05:40 PM   #3
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Originally Posted by 52 Rat View Post
I will soon be changing the mid-plate and input shaft in my LT1 T56 to the LS input and mid-plate. I've been searching but can't find the end play and preload settings for the LS input shaft. I want to make sure I have the preload and bearing shimmed properly. Any help is greatly appreciated.

As 85mike said..basically zero is what it comes out to...
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Old 10-11-2009, 07:18 PM   #4
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As 85mike said..basically zero is what it comes out to...
I knew you guys would come through with the info.! I'm going to tear into the T56 as soon as I get the parts. Thanks again.
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Old 10-15-2009, 04:49 PM   #5
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Originally Posted by 85MikeTPI View Post
Stock values are in the Service Manual (pg43):

http://www.ttcautomotive.com/English...610-0199_2.pdf

I usually add 0.002-0.003 additional shim to the stock values to keep things tight as the aluminum case expands under heat.
Is this checked first without any shims? Than add the correct shim?
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Old 10-15-2009, 07:00 PM   #6
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Is this checked first without any shims? Than add the correct shim?
Yes. The shafts usually have 0.030-0.060" end-play with no shims behind the bearing races. After measuring, you do the math to get the correct end-play or pre-load and shim accordingly.
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Old 05-22-2010, 09:41 PM   #7
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Hmm, I just put my mainshaft in and it has ZERO play without any shims. What do I do now? It seems like it is to hard to turn the shaft.
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Old 05-22-2010, 09:43 PM   #8
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Do you set the end play of the countershaft or the mainshaft first?
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Old 05-23-2010, 08:08 AM   #9
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Hmm, I just put my mainshaft in and it has ZERO play without any shims. What do I do now? It seems like it is to hard to turn the shaft.
Something is not correct if you have no play with the shims out. What's the history behind the trans and this build?

You set the countershaft pre-load first, then the mainshaft, or if you've been doing it long enough, you can set them both at the same time.
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Old 05-23-2010, 09:54 AM   #10
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Something is not correct if you have no play with the shims out. What's the history behind the trans and this build?

You set the countershaft pre-load first, then the mainshaft, or if you've been doing it long enough, you can set them both at the same time.
The tranny is out of my 98 camaro. 3rd started grinding so i took it out to rebuild it. I think its got about 100k on it. I got a level 2 rebild kit and all new bearings from The Gear Box. I just set the countershaft end play but i still have no play and its tight? Anymore info you need to diagnose the problem??
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Old 05-23-2010, 12:11 PM   #11
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I got a level 2 rebild kit and all new bearings
Did you replace the races in the main case, with the new ones from the kit?

Sounds like the bearings and/or races are not fully pressed on.
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Old 05-23-2010, 09:21 PM   #12
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Did you replace the races in the main case, with the new ones from the kit?

Sounds like the bearings and/or races are not fully pressed on.
Thanks for you help. I figured it out. I put the main shaft and the input shaft together and put it in the case and bolted it together to check endplay. I didn't make sure that I had the two together correctly. What a BIG MISTAKE! I cracked the input cf ring. I knew what I was doing, just made a mistake.
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Old 05-23-2010, 11:04 PM   #13
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Per GM SI (service information), 0.003" PRELOAD on BOTH the counter shaft and main shaft.
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Old 05-23-2010, 11:04 PM
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end, gm, input, ls, main, measuring, mid, plate, play, shaft, shim, t5, t56, tool, transmission


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