1. Dan Scully

    Dan Scully Active Member

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    Will a 63 unit fit any 8 and 3/4 housing? 63 still has tapered axle shaft's. Thanks
     
  2. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

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    All 8-3/4 centers will fit any 8-3/4 housing regardless of style of side axles.
    A lot of people actually convert the old axles to the 65-newer side axles.
    Just double check the size of the U-joint since there are two different sizes,BTW.
    Hope this helps.
     
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  3. Dan Scully

    Dan Scully Active Member

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    Perfect .. :thankyou:
     
  4. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

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    Yer welcome.
    Like I said two different sizes of yokes. is what you need to check.
     
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  5. 71Polara383

    71Polara383 Kid with ballcap FCBO Gold Member

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    And even if the yoke is different they sell a conversion U joint that fixes the problem!
     
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  6. 413

    413 Active Member

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    cbarge has some wrong statements Posts 2 and 4.

    The open differentials are different with tapered axles. The center block is 1.25” wide with tapered axles. The center block is 1.5” wide on 1965 and newer flanged axle. I’ll get photos so you will know how to tell the difference.

    The 8.75 sure grips have a 1.5” wide center block or pins, cone or clutch style.

    if you have a tapered axle car swapping to and from sure grip will be a problem. Your axle shaft length is different. Because of the center block size.

    if you have a sweet center section from a 1964 or older mopar it won’t go in your slab, fuselage, or formal car. Because of the center block.

    Chrysler Corp used 3 yoke sizes on passenger cars. 7260 7290 and The 1330 was used in 66 and 67 on some 8.75’s in B and C body cars.
     
    Last edited: Mar 16, 2020
  7. 413

    413 Active Member

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    First photo 1964 and older. 1.25” wide center. Notice the large rectangle block that fills all the space between the side gears and spider gears.

    second photo 1965 and newer. 1.5” wide, same as a sure grip. Notice the smaller round shape and you can see the spider gear shaft and inside the gear area.

    I learned this the hard way when the axle length was suddenly wrong and nothing would fit together any longer when it did previously.

    View attachment 360982

    EC604846-769F-405F-83A5-2D69196FA3D2.jpeg

    A30C583F-F728-4007-96C3-AFD612196CA6.jpeg
     
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  8. cbarge

    cbarge World Famous Barge in a Budget FCBO Gold Member

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    Thank for clarifying the differences..I did no know that,sorry for any confusion.
     
  9. 413

    413 Active Member

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    No problem, glad to share the details. I learned a hard lesson and lost valuable time and $$
    We usually don’t cross between tapered and flanged axles so many don’t know.

    DR Diff was a huge help in sorting all this out.
     
    Last edited: Mar 16, 2020
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  10. 70bigblockdodge

    70bigblockdodge Old Man with a Hat FCBO Gold Member

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    There were longer axles for non sure grip cars. I think it continues all the way till the end of the tapered axles but I'm not 100%.
     
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  11. 413

    413 Active Member

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    Yes! the break point is 1964 and earlier tapered axle, and 1965 and newer flanged axle.


    Tapered axle shafts (1964 and older) with non sure grip are 1/8” longer than with a sure grip.

    With a flanged axle all the axle shafts are the same length for sure grip and open differentials.
     
  12. Dan Scully

    Dan Scully Active Member

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    So I have a 65 housing , axles and all but no center section. I can take my non sure grip section out of my 64 and install it in the 65 housing? Thanks
     
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  13. 3C's & a D?

    3C's & a D? Senior Member

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    From what these more knowledgeable guy's say, yes? I can't say for sure. One thing I will add to watch for is, Axle length, and axle housing width. I once went to replace a pitted axle on a '71 Chrysler, figured I'd use one from the '71 Dodge I was parting at the time. Nope, over an inch too long! Luckily I had another set of good axles from a '71 Chrysler.
     
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  14. ideologist

    ideologist Member

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    Sorry to dredge up an older thread, but I purchased a Sure Grip out of a 69 Super Bee, going into a 65 Chrysler.

    Did they commonly change yoke sizes between the marques and models? I'm thinking about just buying the 7260 to 7290 conversion u-joint to have it handy when I pop the old differential out. Will this be a waste?

    Also, has anyone used the Dr Diff gaskets? Are these good or is there a more recommended gasket source?
     
  15. polara71

    polara71 Old Man with a Hat

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    I use Dr Diff for everything 8 3/4. I have also used the combo joint. It is a good option.
     
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