Need T56 input shaft end play/preload setting.

52 Rat · 10-10-2009, 10:00 PM

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 · 10-11-2009, 02:55 PM

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 · 10-11-2009, 06:40 PM

Quote:

Originally Posted by 52 Rat

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...

52 Rat · 10-11-2009, 08:18 PM

Quote:

Originally Posted by Gen414

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.

ddcarter · 10-15-2009, 05:49 PM

Quote:

Originally Posted by 85MikeTPI

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?

85MikeTPI · 10-15-2009, 08:00 PM

Quote:

Originally Posted by ddcarter

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.