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Old 07-26-2010, 12:20 PM
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11 1/2 bolt circle torque converter

ok i have a 64 impala and need some advice. my dad just had a 700r4 trans rebuilt awhile ago and dropped off a new torque converter last week, just open the box and noticed it won't work the bolt holes on the converter are 9 1/2 and the flexplate on my 454 are 11 1/2 bolt circle. I know this is a stupid question but waht would be the best option? get a torque converter that will fit a 11 /12 bolt circle flexplate or get a new flexplate? thanks

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Old 07-26-2010, 05:39 PM
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I would try and exchange the one you have for the right one if it's new. If not then get a different flex plate. Pay attn. to the tooth count as some flex plates have different amount of teeth.
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Old 07-27-2010, 09:53 AM
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ok thank you
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Old 08-02-2010, 10:39 AM
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Am i missing something??? i have a 454 bbc and am mating it to a rebuilt 700r4 and running into issues with the torque converter.The flexplate on the motor measure 11 1/2 bolt pattern and the torque converter given to me has a 9 1/2 well, cant seem to find a converter with a 11 1/2 bolt cirlce pattern to bolt to the flexplate... What do i need to be looking for ? Im sorry if this is an idiotic question but i have been getting the run-around lately, so any advice would be great!
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Old 08-02-2010, 10:50 AM
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I had this same issue with a Caddilac motor and a t 400..I wound up with going to Hughes Performance to get a converter that fits and works..and has the stall that I needed..turned out it was the most cost effective for me..

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