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Rear Differential issue

 
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Last Post by Richard Otto 2 years ago
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 RegisBodnar
(@regisbodnar)
Estimable Member
Joined: 11 years ago
Posts: 88
Topic starter June 15, 2023 9:48 pm  
Last month I began to experience a shudder in the rear end of my 60 DeSoto Adventurer. The first time it happened, I was defending a 2900 foot mountain on route 30. My wife looked at me as if to say, "Are we going to need this car towed?"
At the foot of the mountain, the shudder quit and didn't re-appear for a few days. Then out of the blue, when I would be making a turn, it would happen again. Being that I want to drive to Chatham next month, I decided to pull the rear end and take it to our local trans and diff expert. He dis-assembled the Sure Grip and he found the cross shaft that holds 2 gears, split in two.
 
He called everyone he could think of and could not find a source for this part. He said in over 50 years he has never seen a cross shaft break like this.
 
I have a 2.93 open differential from my 66 Dodge Polara, so he is removing the Sure Grip and installing part of the open diff with my 3.23 ring and pinion. My rear diff will still be a 3.23, but not a Sure Grip. Not a problem because I don't plan on doing any winter driving, LOL.
IMG 3416
 
 
 
 

   
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DavidFrank
 DavidFrank
(@davidfrank)
Member Admin
Joined: 13 years ago
Posts: 412
June 16, 2023 9:23 am  

Sorry to see that happened, but good thing you decided to take it apart! FYI, I know that in 1959 at least, the axle shafts are very slightly different in length from a sure grip to an open rear. I believe the axle shafts on the sure grip are shorter by about 3/16" or something like that. If that's the case, you'll need those swapped also otherwise you'll end up with a clunk when you turn. There's a story there as to how I know that I can tell you at the convention or when we next talk.


   
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Richard Otto
 Richard Otto
(@richardotto)
Active Member
Joined: 2 years ago
Posts: 13
October 14, 2023 11:49 am  

ISSUE is not a replacement for PROBLEM.

Richard Stuart Otto, Otto's Electrical Service, Inc.
6315 Old Dominion Drive,
McLean, Va. 22101-4715
telephone: 703-933-7000
website: OTTOSELECTRICAL.COM
email: richard@ottoselectrical.com


   
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