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LS1 to TH400 trans. What flywheel to use???

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Old Jan 28, 2011 | 08:44 AM
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Default LS1 to TH400 trans. What flywheel to use???
Picking up my TCI TH400 trans and convert today. What to I need to slap it on the back of an 02 LS1??
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Old Jan 28, 2011 | 11:49 AM
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The stock flywheel and you'll need the gm pt#12621399. You'll need to elongate the flywheel bolt holes.
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Old Jan 28, 2011 | 11:56 AM
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What is that p/n, a spacer? Looking to do the same with the Nova, T400,
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Old Jan 28, 2011 | 12:14 PM
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That part # IS a flywheel from Gm.
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Old Jan 28, 2011 | 12:15 PM
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GM PART # 12621399
CATEGORY: Engine Flywheel
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $76.40
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Old Jan 28, 2011 | 12:52 PM
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I'd still like to know if a flywheel is being made for this conversion. I hate drilling holes bigger and throwing the balance off.
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Old Jan 28, 2011 | 01:34 PM
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if you use a flexplate from an 03 chevy express van 2500 w/a 4L80E you don't have to enlongate the holes. You will need the spacer though as this flexplate is flat. PN/12561399 flexplate, PN/12563532 spacer, PN 14088764 on the bolts X 6. Bolts are longer. use all of this and the TH40 will bolt right up with no mods.
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Old Jan 28, 2011 | 02:43 PM
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GM PART # 12563532
CATEGORY: Engine Flywheel
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $53.39
OUR PRICE: $31.04


DESCRIPTION: SPACER
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Old Jan 28, 2011 | 04:11 PM
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I picked up the flexplate from Autozone for the 02 Camaro for $24.00, and will get the spacer tomorrow from GM. I just hope the counterweight on the plate goes TOWARDS the engine cause the torque conv hits it.
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Old Jan 28, 2011 | 04:17 PM
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Originally Posted by mt5425
I picked up the flexplate from Autozone for the 02 Camaro for $24.00, and will get the spacer tomorrow from GM. I just hope the counterweight on the plate goes TOWARDS the engine cause the torque conv hits it.
Counterweight?
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Old Jan 28, 2011 | 04:20 PM
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Originally Posted by jfg455
if you use a flexplate from an 03 chevy express van 2500 w/a 4L80E you don't have to enlongate the holes. You will need the spacer though as this flexplate is flat. PN/12561399 flexplate, PN/12563532 spacer, PN 14088764 on the bolts X 6. Bolts are longer. use all of this and the TH40 will bolt right up with no mods.
Good info. Interesting that the express van would use a different torque converter bolt circle than the trucks. Have to wonder what GM was thinking on that one.
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Old Jan 28, 2011 | 04:51 PM
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yes, its welded to the flexplate on one side
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Old Jan 28, 2011 | 04:59 PM
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Originally Posted by mt5425
I picked up the flexplate from Autozone for the 02 Camaro for $24.00, and will get the spacer tomorrow from GM. I just hope the counterweight on the plate goes TOWARDS the engine cause the torque conv hits it.
Autozone gave you the wrong flexplate. They have given you a 14088761 which is for an 86 up small block. Go to their site, look up that part and you can see the gm p/n in the picture of it. The correct one should not have a counter weight.

http://sdparts.com/search/node/14088761
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Old Jan 28, 2011 | 05:02 PM
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Originally Posted by mt5425
yes, its welded to the flexplate on one side
Originally Posted by LS1MCSS
Autozone gave you the wrong flexplate. They have given you a 14088761 which is for an 86 up small block. Go to their site, look up that part and you can see the gm p/n in the picture of it. The correct one should not have a counter weight.

http://sdparts.com/search/node/14088761
I knew something was up there.
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Old Jan 28, 2011 | 05:17 PM
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great.....wouldn't happen to know Autozone's correct part # do you?
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Old Jan 29, 2011 | 05:00 AM
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No, but you can order one(correct one) from Rockauto for $51 plus shipping.
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Old Jan 29, 2011 | 07:39 AM
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GM #12621399 is the PERFECT match for the flywheel (flexplate actually). Comes WITH the spacer and new bolts in place! My cost was $61.31 including tax from the dealer. The TCI converter matches perfectly too! Just picked it up this morning. Will be bolting on the 400 in about 10 minutes. I'll keep the site updated.
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Old Jan 29, 2011 | 07:45 AM
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Hey I have a Hughs th400 converter with a 4500 stall and a tci flex plate for sale both used for 500 shipped. Should just bolt right in for ya. Pm me if you are interested
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Old Jan 29, 2011 | 08:50 AM
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https://ls1tech.com/forums/conversio...1-th400-2.html

https://ls1tech.com/forums/conversio...350-5-3-a.html
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Old Jan 29, 2011 | 09:05 AM
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Yep...that did it!! Just got done bolting it all up. Perfect fit!! AND...no cutting,grinding,rubbing,buffing,tugging,pulling,y anking or swearing!
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