Author Topic: Julian date code on THM400's in 1969 model year.  (Read 3567 times)

nuch_ss396

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Julian date code on THM400's in 1969 model year.
« 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



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
69 SS 396, Hugger Orange, D/80, D/90
Chambered Exhaust, N/66, THM400, 3:73 posi

Steve A.
  CRG

Ed Ernst

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1967 SS/RS convertible - LA 12A built

tom

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Re: Julian date code on THM400's in 1969 model year.
« Reply #2 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
69 X11 Z21 L14 glide
looking for a 69 export model (KPH) speed
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nuch_ss396

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Re: Julian date code on THM400's in 1969 model year.
« Reply #3 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

Ed Ernst

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Re: Julian date code on THM400's in 1969 model year.
« Reply #4 on: June 11, 2008, 03:36:06 AM »
I'm guessing here - Maybe it's the 2160th CX configured TH400 built for 69? ???

Z71

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Re: Julian date code on THM400's in 1969 model year.
« Reply #5 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!
Mike
Owned new (and still have stashed away) LOL
1966 Impala SS396
1970 Chevelle SS454
1972 El Camino SS350
1973 Chevelle SS350
2002 Trans Am WS6 Ram Air

nuch_ss396

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Re: Julian date code on THM400's in 1969 model year.
« Reply #6 on: June 23, 2008, 10:20:13 PM »
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