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Old 03-28-2011, 01:54 AM   #1
softballnrd27
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6.0l LQ4 to old school tranny

I want to make sure I have this right:
2004 LQ4(not sure what trans was behind it, I forgot to ask) I am posting a pic so that maybe it will help with what I need to know:

I need to adapt my th350 to the 6.0 If it did in fact come with a 4l80e then I should be good as far as spacer and bolts correct? If not then I need to get the spacer and bolts correct? Then I need the flat flexplate and drill holes for the th350 TC? When I go to mark the holes in order to drill new ones, does it matter where on the flexpalte they are drilled? Should there be a certain distance from the factory holes?
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Old 03-28-2011, 03:56 AM   #2
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Re: 6.0l LQ4 to old school tranny

For the VSS will this one work with the stock computer? I am going to run Autometer procomp gauges and this is the recommended one for GM.
http://www.summitracing.com/parts/ATM-5291/
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Old 03-28-2011, 09:25 AM   #3
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Re: 6.0l LQ4 to old school tranny

Need to determine what flexplate is on the motor. if it has a spacer already then you will just have to drill holes for the TC. If it doesnt have a spacer then you will want a crank spacer.

link to just the spacer pictured above

If you want all new stuff I ship these out:
TCI Flexplate and spacer
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Old 03-28-2011, 03:42 PM   #4
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Re: 6.0l LQ4 to old school tranny

Do these flexplates work with 700's and th 400's also?
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Old 03-28-2011, 03:45 PM   #5
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Re: 6.0l LQ4 to old school tranny

We use them on TH350/400s and I dont see why they would not work with a 700R4, the bolt pattern for the TC is the same.
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Old 03-29-2011, 10:53 AM   #6
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Re: 6.0l LQ4 to old school tranny

http://www.gmpartsdirect.com/

GM PART # 12621399 $44.42

That has the flexplate, spacer, and bolts. All you will have to do is do a little grinding with a die grinder on the new flexplate to match you converter. The bolt holes are close but you have to open them up a little. Working fine on my LQ9/th400 and you won't beat the price!!!

You can see here what I am talking about.




Last edited by augie; 05-21-2011 at 12:55 AM.
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Old 03-29-2011, 02:43 PM   #7
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Re: 6.0l LQ4 to old school tranny

My engine came off of a 4L80 so the flexplate had the correct adapter already there so all I had to do is elongate the converter holes to mount the 700 to it.
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Old 03-29-2011, 03:08 PM   #8
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Re: 6.0l LQ4 to old school tranny

Quote:
Originally Posted by 67shortie View Post
My engine came off of a 4L80 so the flexplate had the correct adapter already there so all I had to do is elongate the converter holes to mount the 700 to it.
You should not have to mess with the converter bolt holes on a "4L80E" flexplate

Quote:
Originally Posted by jkade View Post
GM PART # 12621399 $44.42

That has the flexplate, spacer, and bolts. All you will have to do is do a little grinding with a die grinder on the new flexplate to match you converter. The bolt holes are close but you have to open them up a little. Working fine on my LQ9/th400 and you won't beat the price!!!
Is that what you got from GM parts direct? If so, Its wrong, Looks like a 4L60E flexplate. It should look like this, Notice the 6 converter bolt holes.
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Old 04-01-2011, 03:49 PM   #9
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Re: 6.0l LQ4 to old school tranny

I was wrong, You do have to open up the holes a little, I dont know why GM would change that on the 4L80E from the early ones.
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Old 04-04-2011, 11:04 AM   #10
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Re: 6.0l LQ4 to old school tranny

Quote:
Originally Posted by clinebarger View Post
You should not have to mess with the converter bolt holes on a "4L80E" flexplate



Is that what you got from GM parts direct? If so, Its wrong, Looks like a 4L60E flexplate. It should look like this, Notice the 6 converter bolt holes.
That was a flexplate I had laying around just to see how far the holes were off. I used the one in the kit. The one in the pic will work as it was a dished plate as well but I did not have the spacer.
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Old 04-04-2011, 11:06 AM   #11
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Re: 6.0l LQ4 to old school tranny

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Originally Posted by clinebarger View Post
I was wrong, You do have to open up the holes a little, I dont know why GM would change that on the 4L80E from the early ones.
The 6 bolt converter for the 6.2 matched the holes perfect.
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