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Th400 swappers - cheap flex plate solution

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Old Sep 25, 2013 | 02:30 PM
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Default Th400 swappers - cheap flex plate solution

Look up this part number in any search engine:

Apt z270 flexplate

Its a brand new 6.0 flat flexplate, crank spacer, and bolts for around $50-$65. Much cheaper than using the over priced gm spacer and bolts with a curved ls1 or 5.3 flexplate! It allows for the use of a 11.5" th400 converter bolt circle, not the small th350 10.75 converter bolt circle that requires ovaling holes with a curved flex plate.



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Old Sep 25, 2013 | 02:41 PM
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"Its a brand new 6.0 flat flexplate"

does it work on a 5.3 with a t400?
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Old Sep 25, 2013 | 03:39 PM
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Hmmmmmmmm..... looks like a plan might be forming in my pea brain
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Old Sep 26, 2013 | 03:57 AM
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Originally Posted by vhehn
"Its a brand new 6.0 flat flexplate"

does it work on a 5.3 with a t400?
yes, it will fit any LS engine. i say it is a 6.0 flex plate because they the early 6.0s came with the spacer installed on the flex plate and a 4L80E transmission which mimics a th400. The ls1 and 5.3 engines come equipped with a curved flex plate and a 4L60E transmission.

you can use the GM spacer with your existing 5.3 or ls1 curved flex plate but you need to oblong the bolt holes and run a th350 10.75 bolt circle torque converter.

6.0 flex plate installed =
spacer, flex plate, torque converter

5.3/ls1 curved flex plate =
flex plate, spacer, converter


make sense?
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Old Sep 26, 2013 | 09:00 AM
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I was just trying to help somebody out like I was when I was in the same situation. Obviously if your reading this post you are looking for this and its practically free.

Last edited by 406chvycamaro; Sep 26, 2013 at 11:16 AM.
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Old Sep 26, 2013 | 10:34 AM
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Originally Posted by 406chvycamaro
Im in the process of doing an ls swap in my 68 camaro and ended up with an extra 6.0 flexplate willing to let it go cheap if anybody needs it send me a pm Thanks

Not to be rude, but this isn't the classified forums.. please remove your post and place it in the classifieds area and someone will want it cheap for sure.
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Old Sep 26, 2013 | 12:37 PM
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Originally Posted by BigEd_72455
Not to be rude, but this isn't the classified forums.. please remove your post and place it in the classifieds area and someone will want it cheap for sure.
Not to be rude either but did you even read my original post?

This post isnt selling anything. It just a listed part number for a conversion flex plate. Notice i didnt link the item to any vendor.

What is wrong with people helping out on this forum? I searched high and low looking for th400 swap info. I found this on a random page and thought i would share. If its offensive please remove it.
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Old Sep 26, 2013 | 12:40 PM
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please notice the person quoted....
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Old Sep 26, 2013 | 01:14 PM
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Thanks for the post man, I already bought the TCI one, but this should help my buddy.
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Old Sep 26, 2013 | 02:25 PM
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Thanks man. I was planning on stopping by the dealership on Saturday.
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Old May 21, 2015 | 12:25 PM
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I know this is old but anybody else using this set up?
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Old May 21, 2015 | 01:17 PM
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He's right.
Using a curved FP w spacer will cause starter and FP alignment issues. And possible tq converter issues.
The flat plate w spacer is best solution. On the cheap. if do not need sfi plate
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