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Hi folks, newbie working my way through a frame off restoration 72 Supreme Convertible, was trying clean up rear diff this afternoon, 50 year old zeibart undercoating. Can someone help ID or decode the numbers I found while cleaning it up. What rear end do I have, GM Vintage vehicle services says it is a 2.73 ratio, what does the no on the diff cover mean, as well as the ‘A’ and sideways U, and the yellow paint? And the other numbers on the fron lower face of the rear end? ✌️(Canadian sold car, build date 18 Oct 71). What rear end? Yellow paint rear of passenger axle Decode? The A and the U, and more yellow paint… A thought it should be O? Yellow paint? Decode?
SA = 2:73 non-posi
B = Buick plant
159 = 159th day of the year
2 = 2nd shift
You have the A-casting,as I call it.It has a large "A" on the top of the pumpkin,and an "A" on each side(frontside),where the tubes go in.These rears came in the 71-72 Cutlass/442 that were not built in Lansing,and they came in all 71-72 Skylark/GS cars.If you have the original drums,you will notice a small Buick trishield on the outer edge of the face.
Cool thanks I have the Buick rear end.
Date code 288=Oct 15 1971, which lines up with the broadcast sheet build date of Oct 18.
Not Lansing is interesting to me, as cowl tag says LAN?
Canadian sold car, I was able to get from GM Vintage Vehicle Services rhe Vehicle report which indicated Production Plant St. Louis Missouri, but my cowl tag says LAN.
thanks ✌️ My cowl tag - LAN
