Re: 8 3/4" Third Member Swap Questions?

[<62-65-mail-list-club@xxxxxxxxxxx>]

Not remembering a 985 8.75. Confusion is contagious. :) 

Gary H. 

>  -------Original Message-------
 
>  Hello,
>  
>  I have my self totally confused.  I had a shop replace my 1965 2.94
>  open third member with an unknown year 985 (742?) 3.23 open third
>  member.  The 985 unit was out of a tapered axle differential.  I have
>  not been back to the shop yet but before I go I have questions about
>  the Thrust Blocks (buttons).
>  
>  I know I have them on my limited slip 3.23 third member in another
>  car, I  installed it myself years ago however the more I read the more
>  I don't understand open third members.  It appears that all Mopar 8
>  3/4 third members have thrust blocks?  I pulled the 985 3.23 open
>  third member out of the differential and do not recall seeing any
>  thrust blocks, did I miss something or did I drop them and lost them?
>  However I was not the first person to have been in the differential,
>  the person I got it from had pulled the axles to verify the gear
>  ration on the ring gear, then put the axles back in the housing.
>  
>  Tomorrow I am going to pull the wheels and see if I can check the axle
>  end play.  I know the 1965 differential adjusts with an adjuster ring
>  and not shims like the old tapered axle differentials.
>  
>  The following was copied from the Internet:
>  
>  Any 8-3/4" center section may be interchanged for another as an entire
>  assembly, with the exception of center sections manufactured prior to
>  model year 1964 (See Section 1: "Thrust Block Variations").
>  
>  There was a difference in thrust blocks prior to 1964 that make center
>  section
>  interchange, as well as axle interchange problematic. The thrust
>  block, or "axle shaft
>  thrust spacer", it thr block that both left and right axles butt up
>  against inside the center
>  of the differential. Prior to 1964, all open differentials used a
>  thrust block was approximately 1/8" to 1/4" thicker than units made
>  after 1964.
>  
>  Any suggestions other than checking the axle end play would be
>  appreciated.  Did I make a swap that should not have been done and go
>  back to my 2,94 gears?
>  
>  Thanks
>  
>  Dennis C.
>  
 

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