Smaller Torque Converter for 3.8/4.2 with 4R70W. - Ford Mustang Forum
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post #1 of 2 (permalink) Old 07-01-2019 Thread Starter
Eatel's Avatar
Joined: Dec 2015
Posts: 19
Smaller Torque Converter for 3.8/4.2 with 4R70W.

So I have a 2000 V6 Mustang and the engine is completely torn down. I'm gonna rebuild it as a naturally aspirated 4.2 stroker with a 224/230 cam from SSM, P&P heads, and P&P intakes. I'm told that I'll need a smaller torque converter for this to work properly. However, every 10" converter I can find for a 4R70W has a 10.625" bolt pattern. The 4.2 flexplate that I'll have to use for this swap does not share that same bolt pattern. I've tried to find a flexplate for a 4.2 with a 10.625" bolt pattern to no avail. All I can find is stock 4.2 flexplates. So I'm wondering how can I use a smaller converter with more stall for my new build if I can't find a smaller converter with the same bolt pattern as a 4.2 flexplate or find a 4.2 flexplate with a 10.625" bolt pattern to match all the torque converters that I can find for the 4R70W. I called TCI the other day and they said they don't make a torque converter for the 4.2. They just make one for the 4.6. However, on American Muscle, they have a 3000 stall converter from TCI for sale and they claim it works for both the GT and V6 models, but it also has a 10.625" bolt pattern. Can anyone tell me where I can get a smaller torque converter that I can bolt to a 4.2 flexplate or tell me where I can get a 4.2 flexplate with a 10.625" bolt pattern?

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post #2 of 2 (permalink) Old 07-04-2019
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wmburns's Avatar
Joined: Sep 2010
Location: Houston
Posts: 6,810
Just wondering. Is this V6 internally or externally balanced?

I don't understand why the flexplate that came with the 2000 V6 won't work. I'm assuming that the stroker crank has the same bolt pattern as the original crank. If so, then the original flexplate will work and will work with the industry standard torque converters.

If you know the model and years that include the flexplate in question, then try searching to search salvage yards in your area. But don't forget to match the type of balance (internal or external) of the original motor or vibration will result.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.

Last edited by wmburns; 07-05-2019 at 10:19 PM.
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