8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?

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    Author Topic: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?  (Read 839 times)

    Offline Glennster

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    8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « on: July 19, 2009 - 09:39:08 AM »
    I will be swapping my 8 1/4 rear end for an 8 3/4 and I'll be going from a 904 tranny to a 727. The first thing that come to mind is linkage problems with the tranny, but I figure there must be some other land mines along the way. The drive shaft length was another potential show stopper, I've got a local guy that can help there (shorten it I '' assume'' )
     Can you guys give me some direction on these changes?
    THANKS for your suggestions!
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    Offline thedodgeboys

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #1 on: July 19, 2009 - 09:53:11 AM »
    Slip yoke is different on the 727, u-joints may be larger on the 3rd member of the 8 ¾ as well as the length.

    The brake backing plates may not fit if your plan calls for using the 8 ¼ to the 8 ¾ I don’t know that for a fact you will need to check.  :dunno:

     Is it a floor shift car?
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    Offline Chryco Psycho

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #2 on: July 19, 2009 - 09:55:14 AM »
    actually linkages are the same for both , the 727 is 4 " longer though , you need a new converter for the 904 , mount is the same as well .
     the 8 3/4 is longer then the 8 1/4" as well so swap both at the same time or you will have to shorten the driveshaft twice , the axle tubes are 3 " on the 8 3/4 as well so you will need new shock plates , there are 2 driveshaft yolk sizes , 2 1/8" & 2 5/8 " so you need to match that up or get the conversion U joint to mate them up
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    Offline Glennster

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #3 on: July 19, 2009 - 12:25:08 PM »
     It is a floor shift, the rear end I'm getting comes with brakes. But this thing has been sitting in a field for years, I've got plenty of work to do. I'm 3 hours away from Moser Axle, I think I'll have them rebuild it......................

    Chryco,
     Should I look for a bigger drive shaft, would that be better?
    I've never heard of a conversion U Joint, is that an OK way to go?

    THANKS for the help!
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    Offline vinb

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #4 on: July 19, 2009 - 03:54:29 PM »
    Driveshaft Length :
    833 & 727 with 8 3/4 =  43 7/8" long (center to center) small joints....
    904               "                47 1/2"  "

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    Offline thedodgeboys

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #5 on: July 19, 2009 - 04:00:44 PM »

    Quote from: Glennster on July 19, 2009 - 12:25:08 PM
    It is a floor shift, the rear end I'm getting comes with brakes. But this thing has been sitting in a field for years, I've got plenty of work to do. I'm 3 hours away from Moser Axle, I think I'll have them rebuild it......................

    Chryco,
     Should I look for a bigger drive shaft, would that be better?
    I've never heard of a conversion U Joint, is that an OK way to go?


    if you are that close to Moser why not just get there $400 8 3/4? :thinkerg:

    The conversion u joint is no big deal it just has the small and large caps already installed.

    If you want a used drive shaft I have one I could part with that will go right in.  :bigsmile:

    Scott
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    Offline Glennster

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #6 on: July 19, 2009 - 04:23:49 PM »
    Can I buy a Posi traction 8 3/4 rear end from them for $400?
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    Offline thedodgeboys

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #7 on: July 19, 2009 - 07:12:27 PM »
    Oooppppsssss… Sorry,           my bad  :nono:

    I was referring to just the housing probably more like 2k for a complete setup.
    http://www.moserengineering.com/Images/New%20Products/mo975.pdf

    But a really neat peace, i have one in my car.


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    Offline Glennster

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    Re: 8 1/4 to 8 3/4 & 904 to 727, what land mines to look for?
    « Reply #8 on: July 19, 2009 - 07:28:05 PM »
    I opened that link, SWEEEEEEEEEEEEEEEEEEEEEEEEEEEEET! ! ! ! ! ! ! ! !
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