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  #1  
Old 01-04-2003, 01:50 PM
turbotim23 turbotim23 is offline
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Location: wyoming,Mi.USA
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Default 8 3/4 axle shaft lengths,splines,pinon sizes?

Hi Can anyone explane sizes,lengths and types of parts found in the 8 3/4 rearend and where they would be found? I'm not trying to start the old common 741 vs 742 case type arguments. Where for instance would you find a 30 spline axle vs a 35 spline axle? What are the common b body axle shaft lengths? U joint pinon sizes?Number of teeth under u joint pinon? Differences in number of clutches,springs,plates etc in each type of posi and what parts interchange in all case sizes?strongest parts vs weaker and where each is used. Thanks Tim
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  #2  
Old 01-04-2003, 07:41 PM
dirty dan's Avatar
dirty dan dirty dan is offline
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Default Re: 8 3/4 axle shaft lengths,splines,pinon sizes?

Hey Tim
Did you want catchup with that?
Man, When You ask ,You ask.
I can`t answer all those questions .
But I will tell you what I know of your questions.
First of all the 8 3/4 came with a 28 spline axle not the 30 or 35.
You may or may not find an aftermarket spool or something of that nature splined that way.
The same aplies to the axles.
(U Joint pinion ) size??
mopar used 2 differant Ujoint The larger of the 2 were comonly used in the performance modles and police cars as well as some
trucks.
As for the actule diamiter of the pinion shaft were the yoke slips on.
Again there were 2.
1was a fine spline and one was a course spline.
The 489 case is the stongest setup.
As it has the larger pinion diamiter as well as larger bearrings through out the assembly.
As for B-body axle lenght .
There were 2 of them as well.
I don`t recall the exact year they changed them .
But 73 comes to mind.
Perhaps someone else could help clarify that point.
Sorry I couldn`t be more specific with out going to the parts pile.
But perhaps this will be of some help anyway
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  #3  
Old 01-04-2003, 08:48 PM
John Kunkel John Kunkel is offline
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Sorry Dan but the factory 8 3/4" axle has never come in any other spline count but 30.

Pinion splines are either 10 or 29 and can be identified externally by the hex size of the nut. A 10 spline pinion will have a 1 1/8" nut and the 29 spline will have a 1 1/4" nut.


8 3/4" axle shaft lengths measured from the tip of the splined end
to the outside of the flange:

A BODY
'66-'72= 27 11/16"

B BODY
'65-'67= 28 7/8"
'68-'70= 29 3/16"
'71-'74= 30 5/8"
'71-'73 wagon= 31 21/64"

C BODY
'65-'69= 30"
'70-'71= 30 5/8" (Chrysler & Fury)
'70-'73= 31 21/64" (and '69 wagon)


IMPERIAL (Large Bolt Pattern)
'65-'66= 30 1/8"
'67-'69= 30 5/16"
'70-'71= 29"
'72-'73= 31 7/16"

E BODY
'70-'74= 29 31/32"

A100
'65-'70= 30"

D100
'65-'71= 31 1/8"
'72-'74= 31 21/64
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  #4  
Old 01-04-2003, 10:09 PM
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ehostler ehostler is offline
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Default

Thanks for fielding that John. I still haven't had much of a chance to get the diagram updated. Still trying to figure out how to get all of that information to fit on one page.

I may just have to build a second page to show the extra information that wasn't originally covered.
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  #5  
Old 01-05-2003, 12:14 AM
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dirty dan dirty dan is offline
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Default well well

Quote:
Originally posted by John Kunkel
Sorry Dan but the factory 8 3/4" axle has never come in any other spline count but 30.
Well color me Wrong
My counter must have been broken that day.
Thanks John
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73 chager se 440 727 411 sure grip. 76 dart sport RB 4 speed 35chry 440 727 489`sure grip low7`s high 6`1/8mile. 78 d 100 440 4 speed

Last edited by ehostler : 01-05-2003 at 03:17 AM.
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  #6  
Old 01-06-2003, 04:18 PM
345Dart 345Dart is offline
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thumbsup JK

Good info - as a new member, this is what makes Moparchat different from the others.
thanks from north of the 49th.
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