Author Topic: Eaton Posi Date  (Read 9821 times)

HawkX66

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Re: Eaton Posi Date
« Reply #15 on: April 06, 2017, 05:15:18 PM »
What's assembly date of posi

Original poster was asking about the posi unit stampings...  NOT the gear stampings..
Ah. If that's the case, I couldn't tell you. I don't think it was stamped, otherwise I would have taken a pic of it. I could have missed it though.
 Now that I'm reading it a little closer, my guess is he was asking me for the date the whole posi rear end was assembled. If so... 8/20/69

Dave
69 SS396 X66 L34 M21 BS
Z23 711 U17 Hugger Orange
Semper Fi! USMC 93-02

hihorse

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Re: Eaton Posi Date
« Reply #16 on: April 21, 2018, 02:35:39 PM »
Dave,
Stamping on right tube is assembly of Diff. Was looking for assembly date of posi carrier which is located on flange that ring gear is bolted to.

bcmiller

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Re: Eaton Posi Date
« Reply #17 on: April 21, 2018, 05:48:24 PM »
I am not sure they all were stamped with a date.
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

bertfam

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Re: Eaton Posi Date
« Reply #18 on: April 21, 2018, 06:08:23 PM »
Here's a 2 series and a 3 series posi carrier I have. E 10 8, and J 7 4 (or J 7 A, hard to tell).

Ed
Ed "Bert" Bertrand
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bcmiller

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Re: Eaton Posi Date
« Reply #19 on: April 21, 2018, 07:27:09 PM »
The only one I have easy access to here is a 3 series stamped F 2 J

I had a 4 series a while back that was just stamped 8

Honestly unless you have a COPO car, who cares about the date? Itís not going to be judged or checked unless it needs to be verified as a 4 series with correct COPO internals, which are different than regular posi internals. Now having correctly dated gears (and housing) IS important in my mind. Just my 2 cents. 

Itís ok to be mindful of the numbers, just donít fall over the edge to OCD.  :)
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

bcmiller

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Re: Eaton Posi Date
« Reply #20 on: April 21, 2018, 08:32:39 PM »
And I just chatted with a person that deals with rear end internals every day for his business.

With the new Eaton style posi units being sold today, the internals and cases are a lot stronger than the originals.  Prices on the new ones are typically the same or less than an old rebuilt unit.  Just FYI.
« Last Edit: April 21, 2018, 08:56:50 PM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

bertfam

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Re: Eaton Posi Date
« Reply #21 on: April 21, 2018, 11:36:29 PM »
That E 10 8 posi I posted above could be an E 10 B. Hard to tell.

Ed
Ed "Bert" Bertrand
email me!

hihorse

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Re: Eaton Posi Date
« Reply #22 on: April 25, 2018, 05:26:09 PM »
The only one I have easy access to here is a 3 series stamped F 2 J

I had a 4 series a while back that was just stamped 8

Honestly unless you have a COPO car, who cares about the date? Itís not going to be judged or checked unless it needs to be verified as a 4 series with correct COPO internals, which are different than regular posi internals. Now having correctly dated gears (and housing) IS important in my mind. Just my 2 cents. 

Itís ok to be mindful of the numbers, just donít fall over the edge to OCD.  :)
All assembly dates including one Eaton stamped on the posi carriers is important to me whether car is being judged or not.

bcmiller

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Re: Eaton Posi Date
« Reply #23 on: April 25, 2018, 06:05:15 PM »
And thatís your choice. Whatever...

I mean either itís either original to the car or not.

Mine isnít - because it was originally a 3.73 open rear end.
« Last Edit: April 25, 2018, 06:49:58 PM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

bcmiller

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Re: Eaton Posi Date
« Reply #24 on: June 07, 2018, 11:33:30 PM »
I MAY have an answer on the stamped code for the late 60s.  I have no confirmation on this, just speculation.

The stamped assembly date code can either be on the edge of the ring gear flange, or on the end (see pic below of one I have from a Chevelle).  The stamped format of the digits is month, day, year.  Month and year are letters with just the last digit of the year.  I need to figure out which letter was not used for sure, but it is most likely the I, which is not used for other stamped dates (such as on distributors).

The one attached is H24H - which COULD be August 24, 1968.

For the year 1969, the year stamp would be a J (the letter). I am fairly certain that J in the year position corresponds to a 9. 

In the pic I posted, it has a normal casting date F 14 7 which is June 14, 1967.  The casting date on some units may only have the Julian date (day of the year 1 to 365).  I do not know why the casting date and assembly date would be so far apart, it seems unusual.

(Edited)
« Last Edit: June 14, 2018, 02:19:07 AM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

bcmiller

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Re: Eaton Posi Date
« Reply #25 on: June 08, 2018, 01:42:01 PM »
Typically things like distributors that are date stamped use the following (I is not used for month).
A for January
B for February
C for March
D for April
E for May
F for June
G for July
H for August
J for September
K for October
L for November
M for December

For the year
A - 1
B - 2
C - 3
D - 4
E - 5
F - 6
G - 7
H - 8
J - 9
K - 0
« Last Edit: June 14, 2018, 02:15:03 AM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

bcmiller

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Re: Eaton Posi Date
« Reply #26 on: June 08, 2018, 10:19:32 PM »
If anyone has an original please post the date stamp on the carrier, axle housing assembly date and date of the vehicle assembly.  Thanks.

I may start a thread in Research topics.
« Last Edit: June 14, 2018, 02:21:30 AM by bcmiller »
Bryon / 1968 Camaro SS 396 coupe - now old school 468 big block
1967 Camaro RS/SS 396 coupe L35/M40 - 4 generation family project
Looking for 68 Camaro with body # NOR 181016

janobyte

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Re: Eaton Posi Date
« Reply #27 on: June 08, 2018, 10:50:11 PM »
F227 is the code on my carrier. June 22nd, 67? Still have original ring and pinion packed away. Can post those dates if anybody is interested.

Somebody just pm'd a few weeks ago asking me about the casting date on the carrier.
68 Z/28  born with: 302, drive line, etc..

janobyte

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Re: Eaton Posi Date
« Reply #28 on: June 08, 2018, 11:00:30 PM »
And I just chatted with a person that deals with rear end internals every day for his business.

With the new Eaton style posi units being sold today, the internals and cases are a lot stronger than the originals.  Prices on the new ones are typically the same or less than an old rebuilt unit.  Just FYI.


Yup. Really the way to fly is a bolt in 9" with a nodular iron third member.
68 Z/28  born with: 302, drive line, etc..

janobyte

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Re: Eaton Posi Date
« Reply #29 on: June 08, 2018, 11:11:22 PM »
BV 0424 G1 axle tube. Car is a 04D build.
68 Z/28  born with: 302, drive line, etc..