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5.3 + Dished Flex + GM Spacer = no good

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Old 02-03-2014, 12:02 AM
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Default 5.3 + Dished Flex + GM Spacer = no good

Alright - so i have a dished flexplate, the GM spacer and a 10" converter. If i put the converter against the motor, it bottoms out against the spacer and there is probably a 3/8" or so space between the mount pads and the plate.

I know the flexplate is on properly. Installed : Crank > Flex > Spacer.

now the kicker is i have a 12" stock converter and it will sit flush against the flexplate.

Anyone have any ideas? I'm lost here...
Old 02-03-2014, 06:42 AM
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Does the 10" converter snout have a larger diameter than the 12"?
Old 02-03-2014, 09:30 AM
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What is the 10" converter from? Some converters are intended for use with an offset flexplate. You say the TC mounting ears are ~3/8" from the flexplate. WELL...

.375"= TC to flexplate gap
.400"= LS converter spacer
.025"= Pretty damn small difference

Have you tried mounting the TC directly to the slexplate?
Old 02-03-2014, 11:39 AM
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The snout diameter is the same on both converters.
The 10" converter is for a regular SBC gen 1. Its just noted it must be used with a 168 tooth flexplate (because of the mounting tabs).

If I mount the converter directly to the flexplate, i'm concerned it is too far out of the input shaft.
Old 02-04-2014, 09:50 AM
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Anyone have any ideas?
Old 02-04-2014, 10:08 AM
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Originally Posted by 01FASTWS6
I know the flexplate is on properly. Installed : Crank > Flex > Spacer.
shouldn't the spacer be between the flexplate and crank?
Old 02-04-2014, 10:18 AM
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Originally Posted by 01FASTWS6
Anyone have any ideas?
If everything is apart will the spacer ring fit over the snout of the converter? I've seen some converters that were tighter than others, but I've never had the problem you are having where it simply wouldn't fit on the proper converter for the application.

Originally Posted by Tommy69z
shouldn't the spacer be between the flexplate and crank?
In this situation, no.

For a dished (4L60E) flexplate the order is:
Crank - dished flexplate - spacer - converter

For a flat (4L80E) flexplate the order is:
Crank - spacer - flat flexplate - converter

If you do it incorrectly the starter ring gear won't align and you can't start the engine (among other issues).

Last edited by gofastwclass; 02-04-2014 at 10:24 AM.
Old 02-04-2014, 11:21 AM
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I dont think 3/8s inch is out of spec , call your trany guy to confirm , you need some play so the flexplate can flex , and in all the autos I have done it allways varies , 3/8s is on the big side , but Im not sure that it is too much
Old 02-04-2014, 12:59 PM
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The spacer fits perfectly over the snout. This evening I'm going to put it all together and see if the converter has any space to move back and forth with the trans against the motor. also going to see how it looks without the spacer installed (maybe the snout will fit right into the crank).



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