What year did they fix the 8 3/4 problem

General Mopar Tech Discussions

  1. Tang1964

    Tang1964 Well-Known Member

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    Idk anything about the 8 3/4 except it’s a third member and early editions have some sort of Achilles heel.
    What was that and what year did Chrysler remedy the problem?
     
  2. RemCharger

    RemCharger Well-Known Member

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    I think you're talking about the 2 PC rear axle shafts. They weren't a problem, just harder to work on than the newer 1 piece shafts.
     
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    • Tang1964

      Tang1964 Well-Known Member

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      I grew up mopar sorta. They were just amazing. But I watched an episode of roadkill were they blow one up in a 64 I think. I guess I’ll just have to re watch it and e see.
       
    • RemCharger

      RemCharger Well-Known Member

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      Wasn't that a one legger?
      If you wind up a one wheel peel, at 100 driveshaft mph, 1 wheel is doing 0, the other is going 200mph (×2). At that point simple physics kick in,, you'll end up fucking up your spider gears. Regardless of rear end type.
      Gm 10 bolts as an example, have seen many cross shaft fired straight out the cover.
       
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      • YY1

        YY1 Well-Known Member

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        Is the OP talking about the pressed on brake drums?
         
      • RemCharger

        RemCharger Well-Known Member

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        No, a road kill episode.
         
      • khryslerkid

        khryslerkid FBBO Gold Member FBBO Gold Member

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        I asked Bill Jenkins (Grumpy) about the '64 rear ends and how they held up behind the 426 Hemis. He replied with a gravel voice, "Well you broke an axle once in awhile, then you changed it." He would know! :)
        3IGDNCT7SYI6DKG3P5SOHXVILQ.jpg
         
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        • MIKESPOLARA

          MIKESPOLARA Well-Known Member

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          Or maybe 741 vs 742 case?
           
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          • Ron H

            Ron H FBBO Gold Member FBBO Gold Member

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            Not sure; but the tapered axles were done by '64 I think and didn't like messing with them on my '63. One of the first things I did was install a '65 Coronet rear and a sure-grip out of a '64.
             
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            • Darter6

              Darter6 FBBO Gold Member FBBO Gold Member

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              A sure thing with a peg leg rear.
              If you want to say anything about the 8 3/4 the tapered axle 1964 and older is the only draw back.
              A hub puller is necessary for drum removal.Something that is quite a burden if it hasn't been apart for over 50 years.
              As far as the size of the pinion it is all relevant by how much horsepower you throw at it and what you are doing with it.
              You gotta take what is done on Road Kill with a grain of salt as they say. It's television.
               
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              • cdr

                cdr FBBO Gold Member FBBO Gold Member

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                They NEVER fixed the 8 3/4 LOL,
                 
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                • 440 PHIXX

                  440 PHIXX The Island of Misfit Mopars FBBO Gold Member

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                  1966. The Dana 60 became a mandatory “option” with the 440 and Hemi 4 speed cars.
                   
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                  • RemCharger

                    RemCharger Well-Known Member

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                    Close. 65. Is when you first could not get a 8 3/4 behind a 440 4spd. D53 was mandatory.

                    Edit, stand corrected. In 65 was the 426, in place of the 440.
                    However, there were no 440 4 speeds in 66 with a Dana 60. See above.
                     
                    Last edited: Jan 18, 2022
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                    • 440 PHIXX

                      440 PHIXX The Island of Misfit Mopars FBBO Gold Member

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                      I know they cast 440 blocks in 1965. But they didn’t appear in B bodies until ‘67. The ‘66 Hemi 4 speed cars had the Dana.
                       
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                      • RemCharger

                        RemCharger Well-Known Member

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                        Sorry for 65 it was the 426 wedge. My bad. There were 440 4 speeds in 66, but like you stated none in a "B" body.
                         
                      • WileERobby

                        WileERobby Well-Known Member

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                        • 440 PHIXX

                          440 PHIXX The Island of Misfit Mopars FBBO Gold Member

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                          The point was... the Dana solved the “problem”. E87 D21.
                           
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                          • oldbee

                            oldbee FBBO Gold Member FBBO Gold Member

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                            Lol, they didn’t have to!!
                             
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                            • 1 Wild R/T

                              1 Wild R/T FBBO Gold Member FBBO Gold Member

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                              While I agree the Dana is beefier than the 8.75.. But an awful lot of 8.75's lived behind 440's swapped into 383 4spd cars.... An 8.75 will take more abuse than a GM 12 bolt, more abuse than most stock Ford 9" rears... If you got your 9" with the 31 spline axles & the four pinion track-lok then you got a good one but most 9" axles need allot of parts to make them take the abuse that they are known for...
                               
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                              • Photon440

                                Photon440 FBBO Gold Member FBBO Gold Member

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                                The 3.91 gear-set pinions weren't all that strong either, for some years the factory didn't even fix them if they broke under warranty, they replaced them with a 4.10 Dana.
                                 
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