[Amc-list] From Archives CD Gear Ratios, Codes #3 Rear End ratios

["Ralph Ausmann" <ralph.ausmann@xxxxxxxxxxx>]

There may be other entries in Archive for this item but this describes the 
units codes and ratios,
______________________________________________________________
Ralph Ausmann  -  Hillsboro, OR - > <ralph.ausmann@xxxxxxxxx>
http://mysite.verizon.net/res79g4m/ ... and "check the links"
 Get the AMC-List Archives CD     See 
http://mysite.verizon.net/res79g4m/amc/index.htm

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From: Frank Swygert <farna@xxxxxxx>
Subject: Re: Standard rear axle ratio ID code, breakdown, location....Model 
15, 20
Date: Mon, 13 Jan 2003 10:18:31

Hey Jerry, that "crude C" must actually be a G -- the six cylinder Gremlin 
should have a
Model 15 axle. The Model 20 was used in V-8 equipped cars, but could be 
ordered as a
heavy duty unit (rare in the Gremlin). Easy way to tell is model 15 has the 
fill hole inthe
cover, model 20 doesn't. It's an AMC axle if it has the big nut holding the 
hub on,
otherwise it either has aftermarket axles or is from anopther manufacturer.
On January 12, 2003 Jerry Casper wrote:
> 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".
> 

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