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

[Jimmy Peavy <peaver63@xxxxxxxxx>]

I've never heard of a 985 unit.

On 8/19/19, dennis.1963ply <dennis.1963ply@xxxxxxxxx> wrote:
> 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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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!

1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.
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