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

Yes,

That is what I have in my 1963 3.23 Sure Grip. I didn't know about them and they had fell into the bottom of the housing. We could not adjust the axles, took the 3rd member out and found them.

However the open 8 3/4 3rd member seems to have them also but they are different, they are in the inside and cannot be removed without total disassembly of the 3rd member from what I am reading. I looked, in the 2.94 we took out and they are there in the center.

The question remains if I am able to adjust the axles and I'll find out tomorrow (Tuesday) when I pull the wheels and give it a try.

Thanks for responding.

Dennis C.

On Monday, August 19, 2019 at 7:07:18 PM UTC-7, chuckiiikropke wrote:

Are you talking about the 2 little top hat looking things made of steel that go in the center were the axles go or the axles go against them when there installed. Then there is a pin you have to bend so they stay in? If thats it I dont know the proper name. I thought it was for only sure grips not open rears. I had to install that on mine years ago it was missing on my 323. I think they are 15 or 20 bucks. I did see them on ebay.

Sent via the Samsung Galaxy S7 active, an AT&T 4G LTE smartphone

-------- Original message --------
From: "dennis.1963ply" <dennis...@xxxxxxxxx>
Date: 8/19/19 2:30 PM (GMT-06:00)
To: The 1962 to 1965 Mopar Mail List Clubhouse <1962to19...@googlegroups.com>
Subject: Re: 8 3/4" Third Member Swap Questions?

Oops,

Should have said Sure Grip, not Limited Slip.

Dennis C.

On Monday, August 19, 2019 at 12:07:45 PM UTC-7, dennis.1963ply 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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