CY & CX 400THM: differences & similarities

[Big Block Bill]

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

[Big Block Bill]

Picture of casting date.

Bill

[Mr70]

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 #.

[WILMASBOYL78]

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

[Big Block Bill]

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

[Big Block Bill]

Originally Posted by Big Block Bill

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

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

[Mr70]

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.

[earntaz]

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

[WILMASBOYL78]

Originally Posted by earntaz

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

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

[earntaz]

Originally Posted by WILMASBOYL78

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