trying to figure out differential code
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 6,266
Likes: 156
From: Galloway Twp. NJ
Cruise-In VII Veteran
trying to figure out differential code
I was looking at the code on the differential housing and I'm having looking them up.
here's what I believe is stamped into the housing
AOW2 65E 1
this is exactly how it's stamped onto the pad.
Anybody have any online resources that I can use to decode the numbers?
here's what I believe is stamped into the housing
AOW2 65E 1
this is exactly how it's stamped onto the pad.
Anybody have any online resources that I can use to decode the numbers?
Melting Slicks
Joined: Oct 2005
Posts: 2,056
Likes: 8
From: Redruth Cornwall
book called catalog of corvette id numbers 53-93....not much help im afraid...good luck! will try the net a bit more....
what year diff are you looking at?
what year diff are you looking at?
Last edited by jotto; Aug 13, 2006 at 05:31 PM.
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 6,266
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From: Galloway Twp. NJ
Cruise-In VII Veteran
Originally Posted by chevylit
" AO " code would be found on 1968-1969 rearend denoting a
3:70 ratio positraction with 327/350 engine. Found in Corvette Restoration Guide by Richard Prince.
3:70 ratio positraction with 327/350 engine. Found in Corvette Restoration Guide by Richard Prince.
Hmmmm.............
obviously not the original rear from my '73, oh well.........
but on the bright side I have a 3:70 rear!
Account disabled by user request 5 Jan 09
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(Quote) AOW2 65E 1
this is exactly how it's stamped onto the pad.(Quote)
AO is the code for 1965 thru 1969 3.70:1 posi
for small block with 4 speed.
W stands for Warren Michigan Plant
E stands for Eaton Positraction differential
1 stands for the 1st shift
however, the date code is wrong ...
65-69 used a 2 digit month and 2 digit day code
(ie: 04 09 for April 9th)
1970 used a 3 character differential code,
with the same date code as 65-69.
starting in 1971, the julian date code started.
Your 2 65 obviously is not a month/day code, as there is
no 65th day ... so 265th day is September 22nd.
also note, 1973 had a 3.70:1 code of AB.
So I would do a couple things. Check the numbers one more time, using a toothbrush and some cleaner to make sure of what you have.
Then, on the driver side of the pumpkin, you'll find the casting number and the casting date. If these match up to your car build date, and fall before September 22nd ... then maybe you have a misstamped rear axle ...
Let us know what you find ....
this is exactly how it's stamped onto the pad.(Quote)
AO is the code for 1965 thru 1969 3.70:1 posi
for small block with 4 speed.
W stands for Warren Michigan Plant
E stands for Eaton Positraction differential
1 stands for the 1st shift
however, the date code is wrong ...
65-69 used a 2 digit month and 2 digit day code
(ie: 04 09 for April 9th)
1970 used a 3 character differential code,
with the same date code as 65-69.
starting in 1971, the julian date code started.
Your 2 65 obviously is not a month/day code, as there is
no 65th day ... so 265th day is September 22nd.
also note, 1973 had a 3.70:1 code of AB.
So I would do a couple things. Check the numbers one more time, using a toothbrush and some cleaner to make sure of what you have.
Then, on the driver side of the pumpkin, you'll find the casting number and the casting date. If these match up to your car build date, and fall before September 22nd ... then maybe you have a misstamped rear axle ...
Let us know what you find ....
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Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 6,266
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From: Galloway Twp. NJ
Cruise-In VII Veteran
Originally Posted by LYLE
If you don't have a original rear end you could have any ratio. Post your RPM at 70MPH and tire size and it can be figured out.
that will be a little hard to do right now.
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 6,266
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From: Galloway Twp. NJ
Cruise-In VII Veteran
Originally Posted by FrankVincent
If you're going to check again, you may want
to do the old "spin-the-tire-and-count-the-revolutions" trick ...
That way, you can find out exactly what rear gears you have..
to do the old "spin-the-tire-and-count-the-revolutions" trick ...
That way, you can find out exactly what rear gears you have..
Ok,
but I was actually more concerned with checking to see if it was the original rear.
I'll do the "spin-the-tire-and-count-the-revolutions" trick anyway to see if it's really a 3:70 though.
Team Owner
Joined: Oct 2004
Posts: 23,831
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From: Springfield MO
St. Jude Donor '07
Lots of posts on differential codes buried in the archives. When I asked a month or so back, someone posted the info on figuring out the date code. Probably the only thing that will indicate originality at all, and it's not a guarantee.
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Did you get the casting number and the casting date code?
(from driver side)
and did you figure out what the gearing is?
The picture is exactly as you described,
and may be a misstamp - just need the other
data from above to confirm ...
(from driver side)
and did you figure out what the gearing is?
The picture is exactly as you described,
and may be a misstamp - just need the other
data from above to confirm ...