Technical Speaking of Chevy flywheels or flex plates...

Example 2, further exaggerating the point:


Both of these start, and end at the same theoretical locations.

See if someone can confirm the height, independently, and then call the supplier and ask them what's up, if it is different.

I might be wrong. It is hard to tell from 2D pictures.

 

You could try this link
http://non-stoptransmission.com/en/info-converters.php


A is 6.12 for PG and turbo

 

The converter looks like it was originally a TH350C converter, by the shape of the front of it. Interesting.

 

Yes. Formerly a lock up unit. It looks like possibly a metric core, with the hub changed. In that case, it would need 10 mm bolts and not 3/8" .

 

Well I dug around the shop and found the converter I had in it before this motor and before the Hughes converter was purchased. Did side by side measurements of area “A” from the above drawing. The Hughes converter is right at 1/8” taller than the first converter. I’d use the first converter but the nib was broken off during one of the last runs with the other motor. From where I stand, it looks like I’ll have to get another converter for my roadster. With one expensive snafu already in the mix, can anyone suggest a decent TH400 converter from a reputable store? I bought the Hughes converter from Summit but since it was incorrect from the start, I’m now shy to return to them or Hughes...
Hot rodding gets expensive...
r


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I am a cheap rat bastard. I'd shove a foam rod in the hole, and mill the hub down on the Bridgeport, and then vacuum out the chips, before removing the foam.

 

Well I don’t have a Bridgeport but I wish I did...
r


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Someone near you must.

 

The ends of the input tube don't seal, it seals on the side of the input tube. Use a hand grinder for the end, and a cutoff wheel and file for the notches. Scribe the new lines on it and get to it.

 

If I read correctly you said that converter ate one front pump already. Chances are good that it has “particulate contamination” that could screw up everything again. If it was unused I would do like they suggested and shorten it but if it’s used I’d bite the bullet and replace it.


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I’d at least call summit and Hughes
They are pretty goo


I’d flap disc the nubs Off the converter at flex plate

 

Gimpy,

Did I read that correctly,,,,,”cheap rat bastard “,,,,,,man,,,I am completely surprised !

To be fair,,,,I would do the same thing,,,,,it just caught me off guard to read that from you ,,,,LoL.
Alchemy sounds good too,,,,,I guess I am not alone after all,,,lol.

Tommy

 

I know nothing but read somewhere recently that crate engines sometimes ship with manual trans pilot bushing that obstructs converter from seating to flexplate...

 

It's already in too far.

 

Huh?

 

I wouldn’t put a Hughes converter in a go cart. Coan Engineering if you want something good. Believe it or not B&M used to make a nice converter. Not sure of the quality now but I’d use one if you want something relatively inexpensive.


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I’m fairly shy from reusing the Hughes converter after spending for a complete rebuild and upgrade of the transmission. I think I’ll be scrounging to get enough money to replace it properly.
r


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New England farmer habits die hard.

 

You should not be hesitant to call either of these companies. You’ve got an invoice for a specific part, application and part number.
That’s a fact !
You’ve got a converter that’s not what you ordered.
That’s a fact!
There’s no physical markings as to part numbers on the piece.
That’s a fact !


This is an observation
Apparently its such slight difference that it takes a crew of internet guys to ID it yet in a production facility apparently there’s no way to mix it up and wrong box the part?? Apparently it’s such a slight difference that an experienced transmission guy didn’t pick up on the difference.

This little and slight difference cost you a transmission, also a fact and I doubt either one is going to feel enough responsibility for that but they both owe you the correct converter delivered to your door or a full refund.

 

Maybe so, but they’ll say that I should have caught it during assembly.
r


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You are speculating.

That's not even allowed in court as evidence.

Make the calls.

 

You’re right...
r


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Yep! If you don't ask for the refund....... they won't give it to you.
But if you do ask....... they should.
Step #1 of a refund is the asking.

I recently got a free, second radiator when I had gouged a leak in the first one myself. I asked and I got.
It was an O/T car and the space was tight. The radiator(s) didn't fit well between the uprights, etc. and I had to take it in and out 3 or 4 times while I modified everything to make room. All the extra manhandling and frustration added up to the leak.

 

Mr. Raven , Can I make a suggestion here? If you're going to do this stuff, you might want to invest in a $15 HF digital caliper.
I don't see the converter being 1 & 1/16 " back into the trans. Also the flex distance from the block face is hard to see from here . If those numbers were correct, the trans would install all the way, still leaving room for pull up..
You want to use a straight edge across the bellhousing face , and then measure digitally in to the conv. pad.
To measure the flex pad distance, you want to turn one of the holes down to the flat area between the lower block bolt, and the crank. This is machined along with the rear block face. Use the tail of your caliper , through a bolt hole, to this surface. Do all three hole, because this can vary.
I believe you when you say it doesn't fit, but we still don't know why, for certain.
BTW , when a converter is built long for an adapter, it's done in the front , at the pilot and bolt pads, as mentioned earlier. If the hub is too long, it's just a f/u.

 

Just for the record guys, when bolting the flexplate to the crank, is there another thin plate that goes either in between the plate and crank flange or bolt head and flex plate? Or is it flange/flexplate/bolt?

 

There is on Pontiacs. Never saw them on Chevys

 

Just got back from my friend’s machine shop. Got accurate measurements.
Hughes converter is 6.865 tall. Original converter is 6.680 tall. I believe we have found the problem. Now to talk to Summit.
r


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Just .065 difference,,,I would plug it off and grind the difference down to size .
Only .065,,,,are you certain the pump gear is not in backwards ?

Tommy

 

Try the Calculator again

 

So those dims are from where to where?
Dimension A?