[AMC-list] 68 AMX Tire Q and axle ration

[Nick ALFANO <71amx@xxxxxxxxxxxxx>]

Marc,

Easiest way to calculate the gear ration if you don't have the number of teeth 
on the ring and pinion to calculate off of is to:

1. Jack the rear end of the car in the air
2. mark a spot of the u-joint with a piece of tape or a marking paint pen
3. rotate the tire one complete revolution while someone counts how many times 
the marking on the u-joint make a complete revolution.  
This will be your ration.  slightly more than 3 turns will be a 3.15,  3 and one 
half turns will be a 3.54.  Just shy of 4 turns will be a 3.91, just over 4.10 
and so on. 

Nick
 Alfano Performance
4849-76 st.
Kenosha, WI. 53142
262-308-1302
262-942-8271 after 6pm central and weekends 


Message: 2
Date: Sat, 20 Nov 2010 15:20:25 -0500
From: Marc Montoni <Freedom@xxxxxxxx>
To: amc-list@xxxxxxxxxxxxxxxxx
Subject: Re: [AMC-list] 68 AMX Tire Q
Message-ID: <20101120202758.42AA6984008@xxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"

I said:
>> I just bought a 68 AMX.  290 4 speed.  The tires are dry rotted and I want to
>> get a new set.  Stock Magnum 500 style (but painted) wheels.
>> 
>> Anyone care to recommend a modern size that will fit with no issues?

Ken Ames <ameskg@xxxxxxxxx> said:

>Which differential ratio do you have?

When the weather cleared last week, I spent ten minutes looking for a stamped 
code on the rear axle, but I'll be danged if I can find it.  I even scraped off 
the grime and paint with a razon on those small bosses where I would have 
expected a stamping.  No joy.
I would assume it's a 3.15 or 3.54, although as I recall the 3.54 was more 
likely found on 343/390 cars.
I'm more concerned with fit than performance.  I don't intend to thrash it on 
the track (I have a Spirit to do that with, now).  In short, I just want it to 
look good, handle OK, and not have interference issues.
Any help?

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