Question: numbers stamped on diff.

[tmpugel]

Can anyone dicipher tese numbers that are stamped on the differential of my '63 SWC 327/300. AP 10 20 56

Thanks,
Tom

 

[shark454]

I believe the AP is the ratio (4:11) and the 10 20 is Oct 20th. I am guessing that the 56 is the year (57 model year).

 

[BigJimZ16]

I believe the AP is the ratio (4:11) and the 10 20 is Oct 20th. I am guessing that the 56 is the year (57 model year).

Somehow I doubt that the rear in his '63 SWC was manufactured in 1956. There are more than a few minor differences...

 

[JohnZ]

Can anyone dicipher tese numbers that are stamped on the differential of my '63 SWC 327/300. AP 10 20 56

Thanks,
Tom

Re-check the "56" - it's probably '66. That design of diff didn't exist until late '62 for '63, and someone swapped in a '67 diff in place of the original.

 

[tmpugel]

diff stamp pic

This is the stamp on diff of 63 327/300
Tom

 

[JohnZ]

This is the stamp on diff of 63 327/300
Tom

All '63-'64 diff ratio codes started with a "C"; the "AP" ratio code was used from '65-'67 as small-block 4.11 posi diffs.