Re: mail Digest for 17 Jan 2005 in hour 0:00

[farna@xxxxxxx]

Marty, what Randy means by "2 & 3 series carriers" is 2.xx gear ratioss (2 series) and 3.xx (3 series) gear ratios. Two different size carriers for the same rear axle. AMC made two axles -- the Model 20 (AMC 20) with a 8-7/8" ring gear and the model Model 15 (AMC 15) with 7-9/16" ring gear. You are correct in stating that some ratios are available in one and not the other. That is due to the size of the ring gear (outside diameter, the measurements listed above). You can get more teeth on a larger diameter gear. 

Randy explained the reasons for the different ratios and "size" carriers very well, re-read his post if you need to. Some aftermarket gears are indeed made to fit the stock carrier. If the Richmond Gear website doesn't specify that a new carrier is needed it *should* be safe to assume it will fit the stock carrier. It is possible, hoever, to get the ratio in a different way (Randy gave a good example).

--
Frank Swygert
Publisher, "American Independent 
Magazine" (AIM)
For all AMC enthusiasts
http://farna.home.att.net/AIM.html
(free download available!)
			

 -------------- Original message ----------------------

> Date: Sun, 16 Jan 2005 20:04:35 -0800 (PST)
> From: Marty Bricker <mbrickerusn@xxxxxxxxx>
> Subject: AMC Model 20 rear end parts swap discussion part 99
> To: AMC List <mail@xxxxxxxxxxxx>
> 
> 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