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Mopar Rearends


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#31 Savageman OFFLINE  

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Posted March 24, 2014 - 10:39 AM

I never thought that the original thread I started would go as far as it did. My thanks to all who jumped in on the topic. It has been interesting, educational, and fun to say the least.
Here is a summary of what I learned. (1)Panzers do not have 8 3/4" rears. They were introduced in 1957. (2)The use of 1940 thru 1950 rears answers the timeline question and explains the availability for the production of 10K earlier machines.The pictures and video you provided proves that point. (3)The factory did not care about what ratio was in their machines. At 5 or 10 mph who would know the difference. (4)The rears were installed upside down because of the reversing factor of the jack shaft. (5)To check the ring & pinion ratio turn your wheel two times and count the revs of the pinion. (6)The term "open rear" means it is not a positraction unit.

I met a lot of friends and have learned a lot but I believe it is time to put this issue to rest.

Thanks again,

Dave

Edited by Savageman, March 24, 2014 - 10:40 AM.

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#32 Chris11 ONLINE  

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Posted March 24, 2014 - 05:32 PM

Dave That was great, we all learned from other guys on here. I love this forum.


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#33 stiemmy ONLINE  

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Posted March 24, 2014 - 06:48 PM

attachicon.gifDSCF2159.JPGattachicon.gifDSCF2161.JPGattachicon.gifDSCF2162.JPGattachicon.gifDSCF2160.JPGRear end of my T-70 yard ornament.

 

Couldn't get a couple of these to rotate for some reason. They were in the proper position when I attached them. Sorry about that.

 

AL

Good thing I can rotate my laptop , cause I think the Olady would be pissed about the desktop!!! LOL j/k :thumbs:

 

Great thread.


Edited by stiemmy, March 24, 2014 - 06:49 PM.

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#34 Canawler OFFLINE  

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Posted March 24, 2014 - 09:34 PM

I've got a little more to add to this.

I'm a Mopar fanatic so I'm very familiar with the 8 3/4" rear axle but I'll admit to not knowing much about earlier rear ends that Chrysler used.  I know they say the 8 3/4 was introduced in '57 but as everyone mentioned, Panzers were using something in the earlier '50s that looks a heck of a lot like the 8 3/4.  I sent an email to Richard Ehrenberg, S.A.E., the tech editor of Mopar Action magazine asking the following:  "Hi Rick,I have a general question about rear axle assemblies used by Chrysler before the 8 3/4.  There doesn't seem to be much info on the web regarding '50s rears.  I'm coming at this as a fan of Panzer garden tractors which used narrowed Chrysler rearends.  From what I understand, the 8 3/4 was introduced in '57?  These tractors were produced starting in '54 yet to my eyes the rear axle assemblies appear the same as the later ones.  Just how far back did this design go and what makes the 8 3/4 that much different that they say it wasn't introduced until '57?"

 

His response (in just a few hours... on a Sunday no less):  "Jim-  The pre-'57 axles were similar in many ways, in fact, most (but not all) used an 8.75" ring gear. The primary visual difference is in the differential, most (but, again, not all) versions used a two-piece, bolt-together case, similar to the '58-'68 Power-Lock Sure Grips. There were several design changes between '56 and '57, enough so that, for example, the carrier, and even the carrier-to-housing gasket is different, and few hard parts interchange, not even the ring gear bolts. If you press me to be more specific, however, I'd throw up my hands in frustration -- I simply don't
know.  Rick"

 

So basically, the 8 3/4 rearend wasn't really introduced in '57.  The basic design goes much further back.  They just made enough upgrades in '57 to call it a new rearend.
 


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#35 toppop52 ONLINE  

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Posted March 25, 2014 - 06:56 AM

That makes sense, thanks.

 

I'm a Pontiac guy, but love my Mopars as well, owned '55 Plymouth, '66 Charger,'68 Sport Fury, Satellite and GTX. '69 Charger, 78 Fury Sport and Magnum.



#36 Savageman OFFLINE  

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Posted March 25, 2014 - 08:28 AM

OMG Jim, Did I just read that we are back to square one.


Edited by Savageman, March 25, 2014 - 10:49 AM.

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#37 Savageman OFFLINE  

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Posted March 25, 2014 - 10:49 AM

OK.  Here is my last question and I promise it will be my last.  Of the pictures that Panzerguy posted of his lawn ornament,  What is with the big BUMP on the back of the rearend?  I don't have this on my two machines and have never seen one.

 

Dave



#38 Panzerguy OFFLINE  

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Posted March 25, 2014 - 11:22 AM

AH-HA! I knew that would get you going again. That's why I put them on here :-D
I'm not sure if rears like that were used on the earlier red Panzers, but it's the only one I've seen like that on a T-70 or later.
By the way - the wife asked me what I was looking at on here that was so interesting and I told her, rear- ends. "TYPICAL MAN" :-)
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#39 toppop52 ONLINE  

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Posted March 25, 2014 - 12:13 PM

Looks like a fill plug and drain plug.


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#40 Panzerguy OFFLINE  

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Posted March 25, 2014 - 03:14 PM

DSCF2162.JPG

Looks like a fill plug and drain plug.

Take another look at the pics. Dave is giving attention to the cover being enlarged on the left half side. I would think it's to give room for the gears inside.

 

AL


Edited by Panzerguy, March 25, 2014 - 03:23 PM.

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#41 Chris11 ONLINE  

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Posted March 25, 2014 - 04:45 PM

my rear end

#42 Chris11 ONLINE  

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Posted March 25, 2014 - 04:52 PM

1381782755306.jpg my rear end

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#43 stiemmy ONLINE  

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Posted March 25, 2014 - 06:31 PM

Take another look at the pics. Dave is giving attention to the cover being enlarged on the left half side. I would think it's to give room for the gears inside.

 

AL

Correct. It is clearance for a larger ring gear.


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#44 Panzerguy OFFLINE  

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Posted March 25, 2014 - 07:16 PM

attachicon.gif1381782755306.jpgmy rear end

Yours is the same thing Chris?  Hard to tell from the pics.


Edited by Panzerguy, March 25, 2014 - 07:18 PM.

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#45 Chris11 ONLINE  

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Posted March 25, 2014 - 07:19 PM

Same as the one you have. my t75 is different
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