Differential markings location

[pflaming]

My differential is so cruded over I don't know where to start to find the ratio number. Can it be in different locations? 

[Plymouthy Adams]

on flat, top of hog head (carrier) look just right of the fill plug...maybe a tad lower than even....

[Desotodav]

Should be stamped in the flat section below the fill plug Paul.

[pflaming]

No fill plug on the butt end.

[pflaming]

No plug on the end no number by the plug. 

Edited April 29, 2018 by pflaming

[Plymouthy Adams]

in the top picture...on the right....se the machined flat...this is the bottom, check opposite for similar flat.....clean this....normally the ratio is expressed by gear tooth count..divide the big number by the little number to get the ratio

[DJ194950]

Try looking upward? Some I found are from above  and forward of the fill plug -stamping was done by hand and not are not located in a small area -found several there  on Mopar early third members. Almost anywhere in that area as most are.

Is the truck or the Suburban? Just wondering. May make some difference?

 

DJ

[pflaming]

Can any one read these markings. 

I read it as 3.9F

Edited April 30, 2018 by pflaming

[Plymouthy Adams]

believe you looking at 3.9F  actual ratio express with the letter F for final...no division needed

[countrytravler]

3.91?

[pflaming]

The marking on my '53 is 3.73. The 3.91 was ginseng to me. The drums have stubs so may use those.