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LS1 to TH400 Converters???

Old Dec 13, 2008 | 03:26 PM
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Default LS1 to TH400 Converters???

Ive been looking around for a Torque Converter for my TH400 that can adapt to the stock LS1 Flywheel. Are there any companies that do this? Im looking for a 4400 stall TC. Links would be sweet!

Thanks,
Chris
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Old Dec 13, 2008 | 04:56 PM
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yes yank and a few more have them. I know speed inc sells them you can also use a standard 350/400 converter.
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Old Dec 13, 2008 | 05:49 PM
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Originally Posted by N.Etheridge
yes yank and a few more have them. I know speed inc sells them you can also use a standard 350/400 converter.
To use a standard 400 converter, dont you have to buy the TCI(or equivalant) flywheel or spacers??

I have a Fuddle Converter for my 400 but it stalled 3200 behind a Turbo Buick V6 and am looking for something in the 4000-4400 stall range behind the LS1 Im building
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Old Dec 13, 2008 | 06:00 PM
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Originally Posted by cabech984
To use a standard 400 converter, dont you have to buy the TCI(or equivalant) flywheel or spacers??

I have a Fuddle Converter for my 400 but it stalled 3200 behind a Turbo Buick V6 and am looking for something in the 4000-4400 stall range behind the LS1 Im building
http://store.summitracing.com/partde...5&autoview=sku
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Old Dec 13, 2008 | 06:35 PM
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I am running an old school converter in my 400 along with the hughes adapter and I had to get some indexing converter washers from jegs to get mine to space out right and properly engage the pump in the tranny. Heres the part JEGS #555-82505
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Old Dec 13, 2008 | 06:55 PM
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all you need is a 1998 flywheel from a ls1 car.
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Old Dec 13, 2008 | 07:26 PM
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Originally Posted by SSPerformance
all you need is a 1998 flywheel from a ls1 car.
What makes those special?
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Old Dec 13, 2008 | 07:30 PM
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correct bolt pattern for a LS1 th400 converter
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Old Dec 13, 2008 | 07:41 PM
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Looks like most 5.3L and 6.0L Flywheels are too. can anybody confirm this?
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Old Dec 14, 2008 | 10:28 AM
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I know most 6.0 seem to be because they usually have 4l80's behind them. For the 5.3 I am not sure on that, I am running a 98 flywheel and still had to shim the converter back so I don't think its perfect. Hughes actually says their adapter is made to run with just their flywheel on the website and it has welded on tabs to space it out.
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Old Dec 14, 2008 | 06:21 PM
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My 6.0L was in front of a 4L60/65E.
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Old Dec 15, 2008 | 07:09 PM
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We make direct bolt in converters for the LS1 and a 400 with a factory flexplate that has the correct bolt circle and pilot.

Greg
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Old Dec 16, 2008 | 02:17 PM
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If you have a 6 bolt TH400 converter you need a stock 6.0 flexplate that had a 4l80 behind it. And the spacer that goes between the crank and that flexplate. Bolts right up. If you have a 3 bolt converter, you and use the flexplate and space i mentioned, just need to oblong 3 holes just a little bit.
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Old Dec 16, 2008 | 04:05 PM
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Originally Posted by ForcedInduction
If you have a 6 bolt TH400 converter you need a stock 6.0 flexplate that had a 4l80 behind it. And the spacer that goes between the crank and that flexplate. Bolts right up. If you have a 3 bolt converter, you and use the flexplate and space i mentioned, just need to oblong 3 holes just a little bit.
I have a 4L80 flywheel, spacer and the longer bolts to install it. My question is in order to run it do you have to run a truck starter or will my f-body one work?
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Old Dec 16, 2008 | 04:27 PM
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Your Fbody starter should work fine. When I swapped flexplates on my truck I went from a dished to flat with spacer and it didnt effect my starter. I never really thought about it, until you said something. ahah
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Old Dec 18, 2008 | 04:37 PM
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Well thanks for all the advice/opinions guys.

I have a 3200 stall converter for my TH400. The stall speed was rated that behind a 3.8L Turbo V6 Buick engine that propelled my Firebird to 12.20@113mph.

What do you guys think this converter may stall behind a H/C/I 6.0L?? Any advice??
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Old Aug 11, 2009 | 11:08 AM
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Hey WYATT318MOPAR... what does the TH400 do with your 4.10? Cause my Nissan has a 4.11 and I'm installing a TH400 on the LS1... I wana know gas mileage, and speed rpms through out the gears... what are they..?

Thanks bro...

(btw: I still don't get what is needed in the end, I have a 98 LS1 from an F-body, what do I need exactly for it to bolt on to my LS1? All I know is that I need the spacer from Summit, what else have we came on to agree that is needed with the LS1 98?)

Last edited by wajouba; Aug 11, 2009 at 11:26 AM.
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Old Aug 15, 2009 | 08:35 AM
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I went to the place where he had the TH400, I saw it, checked it out... the question I wana ask... is that he offered to give me the Torque Converter with it saying that I will need to use it, plus he gave me a Flywheel that has 2 hole areas that will make the th400 fit, does he know what hes talking about? and will it work? shim in everyone please, I don't want to buy something that would backfire later...
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Old Aug 15, 2009 | 09:56 AM
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Here is a link to the LS converters to TH350 or TH400

http://www.converter.cc/converters/race/GM/1/

Call for sale pricing
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Old Aug 15, 2009 | 10:24 AM
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Ouch... 845$ kinda high for me now... sorry my salary is 400$ lol... I just graduated and am getting experiance so no money for now... hehe...

Alternative...?

Where is the space going to happen? (wheres the gap?)

If I use TH400 --- Torque (th400) --- Flywheel/Flexplate (98 or old one that has 2 type bolts) --- spacer (from summit)

Where will the space be? the gap? between torque converter and flexplate? and whats another alternative to the Yank Converter?
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