Need Help decoding this rear end
Thread Starter
Administrator
Joined: Jul 2000
Posts: 53,979
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From: About 1100 miles from where I call home.
Need Help decoding this rear end
OK, I *thought* this rear end was a 3:70 Posi from a '72. In examining the stamping (pictured below) I'm confused.
It appears to be AB W 137E 2 5.
The W and the ending 5 are very faint.
Colvin's Corvette Numbers book explains the format as:
AB = 3:70 (check)
W = Warren, MI plant (OK)
137 = Julian date (around May17)
E = Eaton Posi
But supposedly there's supposed to be a single digit for the shift number before the E... and I don't know what the 2 or 25 is at the end. 1972? 72, May? Something else?
Here's 2 pics, blow up as needed. I have no point of reference for the car it came out of.
I'm not great at these rear ends. Where else would indicate the year? Help please.
It appears to be AB W 137E 2 5.
The W and the ending 5 are very faint.
Colvin's Corvette Numbers book explains the format as:
AB = 3:70 (check)
W = Warren, MI plant (OK)
137 = Julian date (around May17)
E = Eaton Posi
But supposedly there's supposed to be a single digit for the shift number before the E... and I don't know what the 2 or 25 is at the end. 1972? 72, May? Something else?
Here's 2 pics, blow up as needed. I have no point of reference for the car it came out of.
I'm not great at these rear ends. Where else would indicate the year? Help please.
Drifting
Joined: Oct 2005
Posts: 1,615
Likes: 150
From: Forth Worth TX
Normally the Julian date has four characters (Month 1-12/day/year). My 1970 diff. is stamped 4 6 70.
In 1971 they only stamped one to three characters for the Julian day of the year. (No number stamped for the year.)
The AB code for the 3.70 axle ratio was also used in 1971, perhaps it was used past 1972 as well.
In 1971 they only stamped one to three characters for the Julian day of the year. (No number stamped for the year.)
The AB code for the 3.70 axle ratio was also used in 1971, perhaps it was used past 1972 as well.
Last edited by Revi; Dec 28, 2014 at 05:31 PM.
Thread Starter
Administrator
Joined: Jul 2000
Posts: 53,979
Likes: 6,207
From: About 1100 miles from where I call home.
Normally the Julian date has four characters (Month 1-12/day/year). My 1970 diff. is stamped 4 6 70.
In 1971 they only stamped one to three characters for the Julian day of the year. (No number stamped for the year.)
The AB code for the 3.70 axle ratio was also used in 1971, perhaps it was used past 1972 as well.
In 1971 they only stamped one to three characters for the Julian day of the year. (No number stamped for the year.)
The AB code for the 3.70 axle ratio was also used in 1971, perhaps it was used past 1972 as well.
edit: my '69 NCRS JG mentioned the year in the rear end stamping for 69/70, which is not detailed in Colvin's book. Lots of info there, but again, more errors.
Last edited by vettebuyer6369; Dec 28, 2014 at 06:06 PM.
