Re: [Chrysler300] rear U joint 57 +; now not available anywhere. Update
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Re: [Chrysler300] rear U joint 57 +; now not available anywhere. Update

On 3/13/2019 10:38 AM, 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300] 
> Hi,
> Anyone know the first year the 300 did NOT  use the �winged bearing
> caps� on rear U joint? (the 2 caps look like �ears� , for 4 bolts,  into
> rear pinion flange) ? the change (? Late 50�s or 60?) was to a
> symmetrical U joint with 4 round bearing caps , which ---I also found
> out today-- has larger diameters on the cross pins, at least on Neapco,
> ---- although the outside diameter of the round bearing caps remains the
> same�so it fits our older drive shafts OK .So it is much much stronger ;
> this is the so called the 7260 joint (�small dodge�) used for  20 +
> years , or a replacement for it, �and readily available. This joint
> works by sitting into �U� shaped machined grooves or seats in the pinion
> flange and is retained side to side by  snap rings or steps (like the
> drive shaft side) and a steel flat strap over the top of U and bearing
> cup , with 4 bolts into flange �U� tops (no U bolts or ears )   ; I have
> located I think a good guy source for the correct flange that fits the
> 10 spline pinion, brand new, cast steel. I believe all 300�s had a 10
> spline 8 � pinion ? Assume all same diameter but do not know that for
> sure. 63 flange has been swapped to 57,a good sign .
> Original idea of using a new 7260 joint with old winged caps is not
> useable , due to the larger diameter stronger cross pins on the 7260
> replacement I have .  So best route appears to be change the flange.
> Will post more on flange once I get one and try all this . All this
> appears to apply to dodge, Plymouth etc 57 era, too.

> Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>

Pretty Sure Ma Mopar was still learning things, 1957 was the year the
more modern rear axle assembly (referred to as the 8-3/4 rear) was
placed into service widely. I've read here and there it was better
then the GM '10 bolt' performance rear axle setup. Buy the wayside,
back in the 60's the biggy GM thing was to get the 10 bolt, Mopars
just kept using the 8-3/4 with out having to use something else until
the Dana's started to show up under some performance cars. But By And 
large the 8-3/4's held up to a lot of HP.

Even Ford went thru a learning curve when they introduced the 9"
differential. It also was introduced in 1957, with changes made in 58
and 59, and 60.

If this ol Noggin recalls rightly

Paul Holmgren
"The apparent lesson of the Inquisition is that insistence on uniformity
of belief is fatal to intellectual, moral and spiritual health."
     -The Uses Of The Past-, Herbert J. Muller



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