CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: nuch_ss396 on June 10, 2008, 12:00:50 AM

Title: Julian date code on THM400's in 1969 model year.
Post by: nuch_ss396 on June 10, 2008, 12:00:50 AM

Hi Guys!

Can anyone give me a 101 level course on the use of assembly codes on THM400 transmissions during the 1969 model year?
Were these codes sequential, or Julian, or something else?

I have a CX coded THM400 with the following information:  69X - 395

(http://i244.photobucket.com/albums/gg15/nuch_ss396/MVC-005F.jpg)

Did each year start with number 1  and progress from there? What does the 395 designate?  Julian date, sequence number, etc.?
What does the 2160 designate?

Help would be appreciated.

Nuch

Title: Re: Julian date code on THM400's in 1969 model year.
Post by: Ed Ernst on June 10, 2008, 12:29:55 AM

Check this, Steve:  http://www.camaros.org/drivetrain.shtml#TransmissionNumbers

Title: Re: Julian date code on THM400's in 1969 model year.
Post by: tom on June 10, 2008, 02:00:11 AM

395 is not a julian date. Julian dates goes from 1 to 365. counts the days of the year.

Tom

Title: Re: Julian date code on THM400's in 1969 model year.
Post by: nuch_ss396 on June 10, 2008, 03:01:09 AM

According to the CRG link provided ( THANKS ED! ), I guess it is a Julian date code.  However, it rolls over into the next year.
So this transmission was assembled on the 29th of January 1969.  That makes sense because it came from a early March '69 L/78.

Now, the 2160 is a sequence number according to the same link.  What exactly is a sequence number?  Was it the 2,160th THM400
built that model year, or the 2,160th Turbo-Hydramatic built?  Anyone know exactly what the sequence number represents?

Steve

Title: Re: Julian date code on THM400's in 1969 model year.
Post by: Ed Ernst on June 11, 2008, 03:36:06 AM

I'm guessing here - Maybe it's the 2160th CX configured TH400 built for 69? ???

Title: Re: Julian date code on THM400's in 1969 model year.
Post by: Z71 on June 11, 2008, 09:42:41 PM

GM's use of Julian dates would start on the first calendar day of the car model year (Jan 1, 1968 for a 1969 model)  and continue thru the end of production of parts for the 69 model.  So if parts production continued into 1969 it would be 366+x days.  Its confusing but that how the did it.

1968 was a leap year!

Title: Re: Julian date code on THM400's in 1969 model year.
Post by: nuch_ss396 on June 23, 2008, 10:20:13 PM

Quote from: Ed Ernst on June 11, 2008, 03:36:06 AM

I'm guessing here - Maybe it's the 2160th CX configured TH400 built for 69? ???

I was wondering about that myself.  But with a late January '69 date, could Chevrolet possibly
have built and installed 2159 CX's before mine?  Were there even that many?

Steve