Cy & cx th400
 

Not to hijack this thread, but I have an N.O.S TH400 Transmission with out a tag on the right side dated 7-69 on the top of the case where it meets the extension housing. It has HOT00604 stamped on the left side above the pan rail where the shift cable would be. Anyone know what this stamp represents? Any help would be appreciated.

Bill

Cy & cx th 400
 

Picture of casting date.

Bill

Bill
That's a transmission that was not automatically assigned to a GM vehicle for service at the beginning,as they sold their own product outright too.
It's dated H for Hydra-matic..0 for 1970...T for Transmission...00604 is the serial #.

NOS Tranny..
 

Don't think I've ever heard of an NOS automatic transmission...very cool. Do you know what version it is...?? Hi-Shift point..??

-wilma

Nos th 400
 

I got it with 5 other bare TH400 cases (I have not checked those dates or stamping's yet) in a parts collection I purchased to get a TON of 1966 Impala parts for a SS-396 I'm restoring.

Bill

Th-400 case
 

Out of the 5 remaining cases I have another NOS case w/H0T03563 stamped on it and a used CT dated 68T-5944. If anyone is interested.

Bill

That's a Service replacement.
HOT03563 stands for:
H=Hydra-Matic..All GM divisions stamped this,regardless of the GM Division using the transmission.
O=1970
T=Transmission
03563=Serial # for Service Use.They started at 00001 and went up to 99999.

The TH400 I have in my Nova is coded CE-68-2624 with a 490 date -- not really sure what it was born in ... but it shifts just fine ... TAZ :dunno:

Th-400...
 

The CE code in 1968 would be for a Chevelle or Camaro with hi-perf 396...since there were no TH-400's behind the solid lifter big blocks in 68 [except Gibb Novas], that would mean an L-34 or L-35 engine.

the 490 date would be sometime in early April of 1968.

-wilma

Thanks Tom -- looks like this is a pretty early tranny. I know that if left in drive at WOT it will shift a skoshi over 5000 RPM ... Craig

Th-400...
 

You can move that shift point up by changing the governor or modifying springs/weights...I may have a hi-shift point unit in the parts. dept if you are interested:wink:

-wilma

Does anyone know the stall on the CX 69 TH400?

I believe 2200 RPM.

Is it possible for a 1970 CW transmission to have no partial vin number?

CW coded TH400..
 

I have seen the partial VIN in 2 locations;

1..on the top side of the pan frame rail, driver's side above shift lever.

2..on the passenger side of the bell housing near the top

most have been in the frame rail location....you will need to have tranny out of the car or have a good mirror/lite to see either location.

**this tranny was only available in the L78 Nova/Chevelle and the LT1 Deuce and Z28. There is typically a pink CW ink stamp on the trans. case.

-wilma

I looked all over and did not find a vin stamped anywhere. Here's the tag for reference. I'll be listing it for sale soon I guess.

CW coded TH400..
 

Given the date code of '478'...this was a unit built in April of 1970. Most likely an L78 Nova application...but, could be from a Z28...Deuce would be a long shot. Not sure if they had CW trannys available over the counter...but, if so there would still be an assembly stamp someplace..

do you have the 6 lug converter...??

Here are some images of partial VIN by pan rail...

I found the vin this morning when it wasn't so dark out. Its a 1970 Camaro transmission. There is no converter. Vin was stamped right on the bell housing flange edge, near where the oil filter mounts.

Norwood or Van Nuys?

Norwood.

1973 CY code trans same as 1969 CY code tranny ?
 

It's kind of funny that I know Larry through Ebay transactions and that we both have the same CY code tranny out of a 1973 Z28 lol

This is possibly a dumb question but would a 1973 Camaro CY code tranny be internally identical to lets say a 1969 CY code trans ?

There is a big difference in the engines they would be mated to - 350 hydraulic small block versus a Hi-Po 427 ?

Thank you,
Jerry

Just picked up a 1969 L-71(LX code) still bolted to the matching CY(th400) and 6 bolt converter.