Differential identification

[motto]

I have a differential or third member that I am unable to identify.
It looks identical to that used in the Chevrolet G506 1-1/2 ton 4x4 and CCKW G-508 6x6 (banjo). Both of which are 6.66:1 or 6-40 tooth count
The 4x2 Chev MCP 1-1/2 ton and C-15 used an identical looking centre but are 6.17:1 or 6-37 tooth count.
This diff is 5.43:1 or 7-38 tooth count.
It will fit straight into any of the above mentioned trucks but can somebody tell me what truck it is out of?
Crownwheel is stamped with P/No 3652282
Pinion is stamped 54-36525
Strangely, the P/No on the crownwheel is stamped over the number 3652522 and the tooth count 7:38 is stamped over 6:37
Thanks in advance
David