I never said the OP's rear end was a 68-70, I said the SD code was used from 1968 thru 1972 and the gear ratio was 3.08:1,
I, also stated "This is the coding scheme for 1971 and later"
I Id'ed the rear by specific features of the housing. Have all 3 styles of '71-72 8.5 A body rears in the racks. Have a 41st and 47th Hollander 5 feet away and didnt waste the time to search through division wide axle stamping codes. Here's why, if you examined enough GM rears of this era, you would not be so eager to ID by stamped code. The stamped codes aren't always right and some are unknown, or very hard to nail down (like all the McKinnon stamped codes for the '68 and '69 12 bolts installed in Canadian built Olds and Buick A body's). Many other rears the stamped axle tube codes are rust pitted or weld spattered. One of the rears in my racks is a 3.91 Anti Spin out of a '68 Olds RamRod, it had some odd brackets welded to it. The weld spatter obliterated part of the code. Also have a '68 nodular casting number Pontiac 8.2 out of a GTO, it was most likely a 3.55 Safe-T-Track, but was later assembled with 4.33 gears, and the 4 pinion STT carrier, and then the axle tube was stamped with the code for a '69 4.33 HD STT. The old friend who professionally assembled it, put in his 428 RA5 headed '69 Judge. Just looking at the ID code and googling, any average car guy would think it is an original Pontiac 4.33 HD STT rear...it's not, does not have the correct nodular casting number. Have run across multiple dozens of similar deals, that's why when I viewed the pictures I noted exactly how to ID the rear.
Anyone can put a stamped code in a Google search bar. The info retrieved is only as good as the quality of the info being inputted to the original book or website. Google any of the large GTO information sites like GTO Heaven, they all have regurgitated lists often filled with errors. Even John Wallace's site, which is often used as a reference, has many errors. Years ago, I sent a quick email to the owner of GTO Heaven site, noting that there were no Pontiac A body's built out of Arlington or Baltimore assembly plants for the '71 model, his info stating that GTO's were being out of these plants for '71 was erroneous. The info I noted is documented by production totals from the plants, his was gleaned from several pages in the front of a Year One catalogue.
Heres another: The Oldsmobility website has pictures of an 8.5 A body center housing up on its website. On at least two dozen times have read website posters note that website link and state that "a '71-72 8.5 A body rear will have the square lugs under the bottom, that's how you identify them". Well that's not totally true, there are two other styles of that particular configuration rear that never had the square transfer lugs on the bottom of the housing.