52 Rat

iTrader: (4)

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.

85MikeTPI

iTrader: (9)

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.

Gen414

iTrader: (38)

As 85mike said..basically zero is what it comes out to...

52 Rat

iTrader: (4)

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.

ddcarter

iTrader: (14)

Is this checked first without any shims? Than add the correct shim?

85MikeTPI

iTrader: (9)

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.

9t8z28

iTrader: (19)

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.

9t8z28

iTrader: (19)

Do you set the end play of the countershaft or the mainshaft first?

85MikeTPI

iTrader: (9)

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.

9t8z28

iTrader: (19)

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??

85MikeTPI

iTrader: (9)

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.

9t8z28

iTrader: (19)

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.

LS123

iTrader: (11)

Per GM SI (service information), 0.003" PRELOAD on BOTH the counter shaft and main shaft.