Standard rear axle ratio ID code, breakdown, location....Model 15, 20

[Gremlingts@xxxx]

 I was looking up this info for a friend, and decided to pass it on to the 
Gremlin list and AMC list, if anyone wants to find out what gear ratio their 
Gremlin has ( or other AMC ). Here they are :

Model 15 rear ( 7 9/16th rear, 6 cylinder , standard rear )
Code Ratio

E 3.58
F 3.08
G 3.31 
H 2.73

Model 20 rear ( 8 7/8 diameter gear, V-8 car, standard rear )
Code Ratio

A 3.54
B 3.15
C 2.87
D 3.91

I believe there is another code for the Twin-grip rear ( 8 codes also, 
runs from U, V, W, X, Y, Z I believe, I will post that another time. This 
code is out of a '74 AMC shop manual. I checked in the '76 manual I have, and 
it is the same code. I also have a factory lineart drawing that I've modified 
to show the locations of the ID codes. Can't send it thru the list, but 
anyone who requests it will get it free. :) Its' in .BMP format and is 
somewhat large for easy viewing. 
To find the location on the Model 15, face the rear of the axle from 
under the gas tank, and on the right axle tube flange of the pumpkin housing, 
there is a huge 1" or bigger "hole" with a dowel that locates the axle tube 
before it's welded in place. Between that hole and the rear gear cover is a 
raised ledge or boss, scrape that off CAREFULLY to find the code indented ( 
not raised ) into the metal there. It's not a very deeply etched letter, so 
don't scratch with a hard pointy object, or you may obliterate the lightly 
etched code! Mine was a crude C on my '78 Gremlin GT with 258 and 4-speed 
tranny. I will check other Gremlins in my driveway to find out what they are. 
:) Hope this tidbit of info helps, good luck to you all finding your "secret 
code".

Jerry in Virginia