CY & CX 400THM: differences & similarities

[nuch_ss396]

[ QUOTE ]

The 6 lug convertors were first used in trucks so you can find trucks with the same convertor shell but everything inside is vastly different. Frank

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Frank,

I recently found a 69 CX THM400 out of an L/78 Nova. I now
need the correct 6-lug converter. I see them on eBay from
time to time, but you comment about the truck converter
being vastly different concerns me. How does one know if
you have a true SHP 6-lug converter? Or, are they still
available from GM with the proper internals for an L/78?


BTW, were the SHP converters stamped or coded in any way?
Steve

[Chevy454]

From some conversations I had with S/SS racer Russ Abrams, who is a Hydra-Matic employee...

[ QUOTE ]
If you have a real CX/CY converter, then look at the OD of the rear section of the converter. It should have letters such as "C" or "D". That indicates a "loose" pump. The trucks have no letters or "A". Six lug converters were used for high rpm or high torque applications. There was a special VB and governor for the CX/CY models, that information disappeared, when GM went to computers to store info. The 400 was out of production ,so the info was canned. Russ

[/ QUOTE ]

[nuch_ss396]

[ QUOTE ]
From some conversations I had with S/SS racer Russ Abrams, who is a Hydra-Matic employee...

[ QUOTE ]
If you have a real CX/CY converter, then look at the OD of the rear section of the converter. It should have letters such as "C" or "D". That indicates a "loose" pump. The trucks have no letters or "A". Six lug converters were used for high rpm or high torque applications. There was a special VB and governor for the CX/CY models, that information disappeared, when GM went to computers to store info. The 400 was out of production ,so the info was canned. Russ

[/ QUOTE ]

[/ QUOTE ]

Rob,

Any chance you or the gentleman you quoted have an image
of the "letters"? Were they ink stamped or punched in.

Does anyone here have an original SHP 6-lug converter that
they can check for these "letters"? I'd like to know more
about this since this is the first I'vw heard of it.

These are the kinds of details you just can't get anywhere
else.

Steve

[KevinCav]

Sorry it took so long, but here are some pictures of the stamping on the 6-lug converter out of my orignal CY transmission.

[WILMASBOYL78]

Attachment won't open for me..??

wilma

[KevinCav]

HELP! I want to post these pic's of the stamping on the converter, but I'm having trouble. Can someone please tell me the correct way to post them? Thanks.

[nuch_ss396]

Kevin,

I sent you a PM.

Steve

[nuch_ss396]

Here are some pictures of Kevin's CY converter.

Steve

[nuch_ss396]

This thread is fantastic !

Now I know exactly what converter I need to look for. Now,
all I need to do is find that needle in the haystack.....

Well, I found the CX THM400, finding one of the correct
torque converters can't be any harder, can it?
Come-on everybody! Tell me it gets easier!

Steve

[Paul D]

I understand that the CW Turbo 400 in a '70 Z28 has a 2400 rpm converter. Is the CW similar to the CX transmission?