Swapping gears on 8 3/4?

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    Author Topic: Swapping gears on 8 3/4?  (Read 3328 times)

    Offline bb71challenger

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    Swapping gears on 8 3/4?
    « on: May 05, 2007 - 12:47:33 AM »
    I just picked up a 741 case 8 3/4 open rear with 3.55's in it. I want to swap the ring and pinion over to one of my sure grip center sections. I have both types of sure grips, a 5.13 clutch type and a 2.94 and 3.23 cone type. Will there be a problem swapping the gears over to one of the other carriers? I prefer to swap over to the 5.13 clutch type as it is more easily rebuildable. Thanks for any help,

    Brett
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    Offline Carlwalski

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    Re: Swapping gears on 8 3/4?
    « Reply #1 on: May 05, 2007 - 01:56:38 AM »


    It should be alright if the other diff is the same style case.
    There were 3 styles: 741, 742 and 489. I don't think you can interchange.

    So, just make sure the cases are the same. :cheers:


    :2cents: :thumbsup:
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    Offline scf100

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    Re: Swapping gears on 8 3/4?
    « Reply #2 on: May 05, 2007 - 06:03:46 AM »
    there is some info on this axle page that may help

    http://www.mymopar.com/Mopar8_75RearEndGuide.htm
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    Offline bb71challenger

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    Re: Swapping gears on 8 3/4?
    « Reply #3 on: May 05, 2007 - 09:04:45 AM »
    Thanks for the infor guys. Looks like I dinged myself over by not making sure it was a 742 or 489 case. Anyone need a set of weak suck 3.55's?  :bigsmile:
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    Offline Chryco Psycho

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    Re: Swapping gears on 8 3/4?
    « Reply #4 on: May 05, 2007 - 11:28:23 AM »
    the sure grip will swap but the gears have to remain in the 741 case as I am sure you now know
     unless you have some serious traction I bet you still cannot break the weak 741 carrier/gears
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    Offline bb71challenger

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    Re: Swapping gears on 8 3/4?
    « Reply #5 on: May 05, 2007 - 11:44:03 AM »
    Quote from: Chryco Psycho on May 05, 2007 - 11:28:23 AM
    the sure grip will swap but the gears have to remain in the 741 case as I am sure you now know
     unless you have some serious traction I bet you still cannot break the weak 741 carrier/gears

    so I could use them along with a sure grip rear for say a slightly built 440? I will build it to be a solid street cruiser with maybe 500-550 horse at the flywheel.
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    Offline Chryco Psycho

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    Re: Swapping gears on 8 3/4?
    « Reply #6 on: May 05, 2007 - 11:47:23 AM »
    as long as the tires will spin I highly doubt you can hurt the gears
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    Offline bb71challenger

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    Re: Swapping gears on 8 3/4?
    « Reply #7 on: May 05, 2007 - 11:55:49 AM »
    Once again, thanks for the quick reply! Masta, masta, grassahoppa betty betty fankful  :bigsmile:
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    Offline Carlwalski

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    Re: Swapping gears on 8 3/4?
    « Reply #8 on: May 05, 2007 - 08:09:03 PM »


    What transmission are you running? Auto or Manual?
    If it's a manual you may run a greater risk of blowing something.
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    Offline bb71challenger

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    Re: Swapping gears on 8 3/4?
    « Reply #9 on: May 05, 2007 - 09:37:51 PM »
    727. I most likely will not even have a stall convertor so I am hoping it will be fine. I think 3.55 would be perfect for me. If my engine is strong enough I would like to even consider keeping the 2.94 sure grip that is in the car now. I like the nice low rpm cruising speed.
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    Offline abodyjoe

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    Re: Swapping gears on 8 3/4?
    « Reply #10 on: May 17, 2007 - 06:14:22 AM »
    i would leave the 3:55 ring and pinion in the case that its all ready set up in and just stick the sure grip unit from one of your other center sections in it...

      the sure grip units interchange between the different center sections...   most you'll have to do is change the bearings on it i believe...
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    Offline abodyjoe

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    Re: Swapping gears on 8 3/4?
    « Reply #11 on: May 17, 2007 - 06:17:10 AM »
    Quote from: Chryco Psycho on May 05, 2007 - 11:28:23 AM
    the sure grip will swap but the gears have to remain in the 741 case as I am sure you now know
     unless you have some serious traction I bet you still cannot break the weak 741 carrier/gears


      i don't think i would worry about the 741 case too much...  especially with an automatic....    i'm running a 741 in my dart and last time out had about 6" of air under the left front tire and it is still going strong....
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    Offline bb71challenger

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    Re: Swapping gears on 8 3/4?
    « Reply #12 on: May 17, 2007 - 03:10:08 PM »
    Quote from: abodyjoe on May 17, 2007 - 06:17:10 AM

      i don't think i would worry about the 741 case too much...  especially with an automatic....    i'm running a 741 in my dart and last time out had about 6" of air under the left front tire and it is still going strong....

    That makes me breathe a little easier. I did not want to spend 60 bucks on a pig I could not use.
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    Offline oldkimmer

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    Re: Swapping gears on 8 3/4?
    « Reply #13 on: May 26, 2007 - 03:09:29 AM »
    Considering all the max wedges and earlie hemies used the 741s I dont think u will have a problem...Ive seen a couple A bodies running 10s on a 741 case..............kim..........
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    Offline 422STROKER

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    Re: Swapping gears on 8 3/4?
    « Reply #14 on: May 26, 2007 - 09:05:07 AM »
    Quote from: bb71challenger on May 17, 2007 - 03:10:08 PM
    That makes me breathe a little easier. I did not want to spend 60 bucks on a pig I could not use.

    60 bucks was a good deal.

    Tom
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