Differential identification
 

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

So what's in the Studebakers? Same ratio as the GMC, or different?

Hi Lynn
As far as I know the Studebaker US 6s all used Timken split diffs.
The GMC used either the company banjo axle with removable hypoid centre or the Timken split diff with spiral bevel arrangement.

David

Axles
 

I know that the smaller axle used in the one ton trucks will fit from 1971 back to about 1948 and back further if the side gears are swapped to match the splines on the axles. The bigger trucks are probably the same as far as being interchangeable with many years. The 6:17 ratio was still in use into the 1970s, but I have never seen a numerically lower ratio in a truck. Years ago I helped a friend change the engine in a forklift, it had a 235 and we put in a 350 V8 because we had one. It also used a GM axle with dual wheels with 8:25/20 tires, but I don’t know what the ratio would have been.