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Old Oct 31, 2009 | 09:36 AM
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I'm getting ready to convert my LT1 t56 to LS1 input shaft and mid plate. I know some of you recommend .002" of bearing preload. To set this, do I assemble without shim, check endplay ? Say I have .035" endplay, do I install .037" shim then re assemble ? Thanks in advance, Dean.
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Old Oct 31, 2009 | 09:41 AM
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Originally Posted by DeanJ
I'm getting ready to convert my LT1 t56 to LS1 input shaft and mid plate. I know some of you recommend .002" of bearing preload. To set this, do I assemble without shim, check endplay ? Say I have .035" endplay, do I install .037" shim then re assemble ? Thanks in advance, Dean.

No, install everything as it would be put together, and take your reading.
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Old Oct 31, 2009 | 10:11 AM
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Originally Posted by DeanJ
I'm getting ready to convert my LT1 t56 to LS1 input shaft and mid plate. I know some of you recommend .002" of bearing preload. To set this, do I assemble without shim, check endplay ? Say I have .035" endplay, do I install .037" shim then re assemble ? Thanks in advance, Dean.
Yes.. You have to measure without any shims, then add the additional preload value to the reading.. You can't measure preload once it's installed, you would only be able to measure end-play.
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Old Oct 31, 2009 | 10:22 AM
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Originally Posted by 85MikeTPI
Yes.. You have to measure without any shims, then add the additional preload value to the reading.. You can't measure preload once it's installed, you would only be able to measure end-play.


Glad 85MIke caught it, sorry bout that. I went straight past the preload, and was referring to endplay, and not bearing preload.
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Old Oct 31, 2009 | 05:28 PM
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Originally Posted by 85MikeTPI
Yes.. You have to measure without any shims, then add the additional preload value to the reading.. You can't measure preload once it's installed, you would only be able to measure end-play.
Will .002 be the correct preload I should shoot for, or do I need some end play? I've only built automatics before and they always have some endplay. Thanks, Dean.
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Old Nov 1, 2009 | 08:40 PM
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0.000-0.002" preload is what I shoot for on the inputshaft. This is about .002" tighter than specs. The countershaft is spec already tighter than the input, so adjust accordingly.
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Old Nov 1, 2009 | 08:57 PM
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Hi, I'm generally unfamiliar with these trannies, but am about to dive into a 6.0L/T56 build for my chevelle. I've run across two LT1 T56s and just starting searching how simple or difficult it would be to put an LS1 type input shaft in an LT1 trans. Is a it big deal? Is there a specific donor piece I should look for (or maybe an upgraded piece)?

Also, what's the mid plate swap about?

Thanks,
TJ
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Old Nov 3, 2009 | 10:16 AM
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You need to swap the Midplate and Input Shaft to make it a LS1 type from a LT1 type..or vice versa.
It's not hard to do, all you need is that specific Input Shaft and Midplate.
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Old Nov 3, 2009 | 06:31 PM
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Originally Posted by NOS327
Hi, I'm generally unfamiliar with these trannies, but am about to dive into a 6.0L/T56 build for my chevelle. I've run across two LT1 T56s and just starting searching how simple or difficult it would be to put an LS1 type input shaft in an LT1 trans. Is a it big deal? Is there a specific donor piece I should look for (or maybe an upgraded piece)?

Also, what's the mid plate swap about?

Thanks,
TJ


make sure it is NOT a 93 unit....94-97 are OK to use.

Midplate, bellhousing, hydro's, inputshaft, but a 10-15 minute job....
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Old Nov 3, 2009 | 10:30 PM
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Originally Posted by 85MikeTPI
0.000-0.002" preload is what I shoot for on the inputshaft. This is about .002" tighter than specs. The countershaft is spec already tighter than the input, so adjust accordingly.
Thanks much Mike, Dean.
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