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Old 03-06-2010, 11:12 AM
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Flywheel not lined up

Hello there i have my th350 in my car mounted it appears the that the bolt holes on the tourque converter are not in alignment with the openings on my flywheel it is the correct flywheel for the application any suggestions i was thinking perhaps loosen the bellhousing bolts and wiggle it around a bit perhaps it is about a half centimeter of lining up

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Old 03-06-2010, 11:32 AM
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You should be able to rotate the converter ... easily.
If it will not move, it is most likely in a bind and NOT seated all the way into the front pump

I suggest you back the Turbo 350 ... OFF and free the converter before serious damage is done.

Most times ... my converters are 1/2 of a inch or more away from the flywheel before I bolt them up tight.



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Old 03-06-2010, 12:37 PM
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There's an ARTICLE in the wiki about this very problem...
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Old 03-06-2010, 01:09 PM
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the converter is able to turn freely not binding maybe im not explaining clearly the bolt goes through the hole in the fly wheel and threads into the tourque converter or it should if turn the converter to line it up with a hole in the fly wheel there arent in line ... if that makes more sense
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Old 03-06-2010, 01:29 PM
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Quote:
Originally Posted by blinky_1986
the converter is able to turn freely not binding maybe im not explaining clearly the bolt goes through the hole in the fly wheel and threads into the tourque converter or it should if turn the converter to line it up with a hole in the fly wheel there arent in line ... if that makes more sense
Yeah- it does.

There are at least two different bolt spacing for TC's. Obviously, your flexplate lacks the bolt pattern for your new TC.

The only way I know of to safely do this would be to have the flex drilled by an accurate method (likely a machine shop operation) or get a different SFI-type flexplate that has the correct pattern already in it.

The problem w/drilling it at home is getting the centers off- even off a small amount could cause hella bad vibrations and could even break the flexplate.
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Old 03-06-2010, 01:40 PM
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Are you100% sure you are lined up with the proper holes? Some of the flywheels have more holes and i have seen people try to go through the wrong holes that are not for the converter and some for duel pattern i would double check and see how many holes are there. JMO Did all the holes you are useing line up with the converter and was you able to get the bolts through all the holes? Or as stated you may have the wrong plate.


Cole

Last edited by eloc431962; 03-06-2010 at 02:20 PM.
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Old 03-06-2010, 01:46 PM
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this fly wheel was purchased new for this particular transmission should be somewhere around 150 some odd teeth anyone have a flywheel resource of some sort??
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Old 03-06-2010, 02:13 PM
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"Torque converters for TH350 and TH400 transmissions are produced with both 10.75" and 11.50" diameter converter bolt patterns. To identify the correct pattern, measure from the converter center to an attaching bolt hole and then multiply this dimension by 2."

So, if you're missing by 3/8"- this is your problem.

From GM.
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Old 03-06-2010, 02:17 PM
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Many flexplates have both sets of holes, have you checked to see if you have, and/or it might line up with a 2nd set?
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Old 03-06-2010, 02:20 PM
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Quote:
Originally Posted by Rickracer
Many flexplates have both sets of holes, have you checked to see if you have, and/or it might line up with a 2nd set?
Thats what i was talking about in my previous post.

Cole
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Old 03-06-2010, 02:24 PM
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Quote:
Originally Posted by eloc431962
Thats what i was talking about in my previous post.
But, guys- don't you think he's turned the TC several times while checking for this?

But I do sometimes get in trouble giving the benefit of the doubt...

Last edited by cobalt327; 03-06-2010 at 02:35 PM.
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Old 03-06-2010, 02:27 PM
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just checked only 1 set of holes i was pretty sure but double checking never hurts i have the original flex plate from the car its from an 86 305 the trans is 84 i believe but i dont think that would make a difference
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Old 03-06-2010, 02:29 PM
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Quote:
Originally Posted by cobalt327
But, guys- don't you think he's turned the TC several times while checking for this?

But I do sometimes get in trouble giving the benefit of the doubt...
I know exactly what you are saying Cobalt . I was just agreeing with rick on his post thats all I totally know where you are coming from. And as the OP stated it all came together as a package deal need to call company and talk to someone . well he said for that paticular trans anyway.


Cole
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Old 03-06-2010, 02:40 PM
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Quote:
Originally Posted by eloc431962
I know exactly what you are saying Cobalt . I was just agreeing with rick on his post thats all I totally know where you are coming from.
It's all good, Cole. And Rick.

I just hate to come across as condescending to someone- who may well know twice what I do on a particular subject.

But FWIW, I just checked 7 flexplates I have sitting around- and wouldn't you know every dam one of them are the same TC pattern?

I'd be SOL if I were in the OP's place. But at least I would have a fresh tranny and TC to play with!! lol
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Old 03-06-2010, 02:43 PM
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It's all good here to Cobalt, You are a good Man and i value all you opinions. I have learned quit a bit from you on this site. You know what they say we are never to old to learn. Honestly Cobalt i read all your post you are a very knowledgeable person.


Cole

Last edited by eloc431962; 03-06-2010 at 02:51 PM. Reason: had to add something
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