RE: [Chrysler300] Rear Axle Bearings - more info?

[William Huff <whuff@xxxx>]

Hi John and Group,

This discussion has been going on for at least 20 years that I am aware 
of. Same arguments, same logic. There is no doubt the tapered bearing is 
stronger, it is also a lot more temperamental. If the end play is not set 
correctly, spalling and brinnelling are the result. Also, if the end play 
is not set properly, the resulting slack is hard on the seals. As I 
recall, Art Morrison developed the green bearing specifically for 
Mopars. I can't speak to roundy round racing, but I have been drag racing 
two Mopars in the 425-450 HP (rated, not rear wheel) range for some 20 
years and never had a problem (or a leaky seal) yet. One of the cars was 
my daily transportation for several years. Have pulled the pumpkins several 
times to change ratios and just slid the axles back in. The same stock 
retainers are used, so the safety retention of the axles remains as the 
factory intended. I like the green bearings and intend to continue using 
them unless strong evidence is presented that they really don't work 
properly. My experience does not indicate that.

Bill Huff



At 4/27/03 -0700 09:39 AM, you wrote:
>As I understand the terminology correctly.
>
>A "Green" bearing is a simple ball bearing composed of a series of balls 
>supported in a "Cage" that keeps them spaced apart to separate the load on 
>the races. They are designed to primarily support the radial load on a 
>shaft. That means, mostly just the downward force of the load on a 
>horizontal shaft.
>
>A "Tapered Roller" bearing is comprised of exactly that. Instead of 
>spherical balls, they contain tapered rollers that support the load both 
>at a right angle to the shaft and in a thrust vector towards one end of 
>the shaft or the other. If you want to support a thrust vector in both 
>directions on the shaft, they are used in pairs.
>
>Our front spindles use two tapered roller bearings. The inner one takes 
>care of both a downward load and the sideways thrust in an outwards 
>direction. The outer one takes care of both the downward load and the 
>sideways thrust in an inner direction. This keeps the rolling element 
>(the hub with drum or disk) centered between the bearings.
>
>On the rear axle application, the stock design calls for a tapered roller 
>bearing on the end of each axle (with seals). This allows for load 
>support both downward and for any lateral or sideways forces.
>
>If our cars were to just run in a straight line without any cornering the 
>"Green" bearings would be plenty adequate. But as soon as you start to go 
>around a corner the "Green" bearings are trying to carry additional 
>lateral loads.
>
>The bottom line is the "Green" bearings are cheaper to make. Our cars 
>(and most other ones too) were originally designed with tapered roller 
>bearings and deserve them.
>
>John Mc Adams
>
>
>-----Original Message-----
>From: mr-320@xxxx [mailto:mr-320@xxxx]
>Sent: Sunday, April 27, 2003 5:30 AM
>To: John Hertog
>Cc: William Huff; Chrysler300@xxxxxxxxxxxxxxx
>Subject: Re: [Chrysler300] Rear Axle Bearings - more info?
>
>
>john and all;
> back in 72, when they first came out, i replaced the axle brgs.
>on a 71 hemi gtx with the green full floating style and within 6 mos i
>had one of them collapse completely. i retrofitted back to stock mopar
>and havent tried them again since, havent had any trouble since either.
>i presume its possible that there was just something wrong with the
>individual brg, or the installation, but i doubt it, i think that the
>tapered rollers are just a much stronger system, and i intend to stay
>with them.
> for what it is worth!!!!!
>
> JEFF
> tucson az.
>
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