Re: AMC Model 20 rear end parts swap discussion part 99

[Ken Ames <amesk@xxxxxxxxxxxxxxxxxxxxxx>]

The 8 7/8 and 7 9/16 differentials are 2 different ones. The smaller is used on
4 and 6 sylinder cars and is called the Model 15. AFAIK none of the gears from
one will fit the other whether they have similar ratios or not. Don't get them
confused. :)
 
Ken

Quoting Marty Bricker <mbrickerusn@xxxxxxxxx>:

> Randy,
>   I was the one who resurrected the model 20 rear end
> discussion but I'm still not entirely clear on how it
> all works.  From your post you said there are series 2
> & 3 carriers for passenger cars.  I'm not sure what
> that equates to but, from my 74 TSM I would guess the
> 2 different axle sizes (8-7/8 and 7-9/16) as you said
> the carriers are physically different.  I posted my
> question on the AMC Forum also and one of the listers
> compared carriers from a 2.87 and 3.15 rear end and
> said they were exactly the same size (both are listed
> for the 8-7/8 axle).  My 74 TSM lists 2.87, 3.15, 3.54
> and 3.91 ratios as being in the 8-7/8 axle and 2.73,
> 3.08, 3.31 and 3.58 ratios as being in the 7-9/16
> axle.  Unless the different carriers (series 2 & 3)
> can be used in the different axles, a manufacturer who
> says his gears will fit 3.08 and above should fit in
> both axles and on both carriers.  It would seem to me
> that the fit is based more on the carrier and/or axle
> than the ratio.  Sure wish I had the different
> carriers and gears to look at to clear up my
> confusion.  Guess my problem is the gears on Ebay I'm
> looking to buy (Richmond 3.54) and replace my 2.87
> gears (74 AMX with 8-7/8 axle) I can't seem to find on
> the Richmond website to verify that they will or won't
> fit.  I counted the teeth on the ring gear in the pic
> and they are the same (39) as the AMC listing in the
> TSM.        
> Marty
> 
> 
> 
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