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Old June 5th, 2009, 08:55 AM   #1
JeepMann
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Default Flexplate bolt pattern?

Are there different bolt patterns for the torque converters for different transmssions? I am running a 700R4 but the bolts for the torque convereter don't line up. The flexplate was last used on the engine mated to a th350. I looked on napa & autozone's websites but there are differences listed for bolt pattern. Am I missing something here?
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Old June 5th, 2009, 10:44 AM   #2
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what engine? i know the flexplate on my 350 has 2 different patterns on it.
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Old June 5th, 2009, 11:15 AM   #3
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Originally Posted by Kodiak450r View Post
what engine? i know the flexplate on my 350 has 2 different patterns on it.
350, older block from the late 70s. I will have to look to see if I have 2 patterns on it too...hmmm thanks for the heads up.
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Old June 9th, 2009, 03:57 PM   #4
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Yes. Recently had my flexplate replaced on the 87 Suburban with 350/700r4 and there was a pattern difference issue.
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Old June 11th, 2009, 08:31 PM   #5
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There are always 2 patterns on chevy flexplates, inner tri, and outer tri.
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Old June 12th, 2009, 10:42 AM   #6
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Originally Posted by InspectorCloussou View Post
There are always 2 patterns on chevy flexplates, inner tri, and outer tri.
Except for the ones that one have one pattern.
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Old June 22nd, 2009, 01:29 PM   #7
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OK i did in fact have 2 bolt patterns so I am good there. Next question though......The torque converter is engaged in the trans but it sits about a 1/2" or so from the flexplate. Is this normal? If I draw it in will disengage from the trans?

Just for extra info, this is a late 70s 350 block with a flexplate that was mated to a th350 and bolting up to a 700R4.
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Old June 22nd, 2009, 02:57 PM   #8
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yes you pull it up to the flexplate. this is normal.
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Old June 22nd, 2009, 05:07 PM   #9
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Considering the notch in the converter shaft that drives the trans pump is only about " deep, Id check to be sure that a good portion of the notch still engages the pump in the trans with the converter bolted to the flex plate.

TCIs installation instructions call for a minimum of 1/8" but no more than 3/16" of converter movement. You can use washers (preferably precision ground ones) between the converter and flex plate if necessary. Youll most likely need longer bolts as well. That is what was recommended by TCI and has worked for more than 10 years with one of their towing converters in my truck.

Here is something that came up in a simple Google search: http://www.partshp.com/ConverterInstructions.htm Do some searching on your specific combination or go to the converter manufacturer's site for the most accurate info.
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Old June 22nd, 2009, 07:37 PM   #10
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Thanks Brods for the information.

The reason I bring this up is because years ago I built a S10 blazer with a similar engine/trans combo and I burnt up the trans pump after about 1000 miles. The trans guy told me that my converter wasn't engaged enough and caused the failure. I was never sure if this was true or he was just blowing smoke being I was pretty young at the time.
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