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Thread: Factory 3.73 gear and g80

  1. #1
    Join Date
    May 2009
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    Plainfield, IL
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    Factory 3.73 gear and g80

    My truck is in the shop now getting a 4.56 and detroit true-trac


    Does anyone have a use for this? I can get pics when I pick up the truck, if anyone is interested.


    has low miles on it (about 45k or so), just changing because of tires
    blown transmissions are about as useful as 97% of the guys on this forum

  2. #2
    Join Date
    Nov 2009
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    Fort Smith, Arkansas
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    This won't work in a 2wd OBS will it?
    '91 2WD RCSB
    5.3l L59 DBW
    4L80E
    TR220 cam
    RevMax 2800rpm stall converter
    Schoenfeld LT Headers
    Nelson tuned

    My Truck Video - http://www.youtube.com/watch?v=Rw9y1...&feature=email

  3. #3
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    Apr 2008
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    Birmingham, AL
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    Nope
    01 Silverado

  4. #4
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    price?
    Blessed be the Lord my strength which teacheth my hands to war, and my fingers to fight:
    Psalms 144:1

    Si vis pacem, para bellum

  5. #5
    Join Date
    May 2009
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    I was thinking like 150 shipped. Got the truck back today (had wrong axle seals, took a day to get the right parts). My buddy picked it up, and forgot to grab the old stuff. The guy who did the work said the other stuff looked perfect, and I'm picking it up monday.
    Last edited by oleshifty; 06-08-2010 at 07:45 PM.
    blown transmissions are about as useful as 97% of the guys on this forum

  6. #6
    Join Date
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    8,031
    Quote Originally Posted by flattopwill View Post
    This won't work in a 2wd OBS will it?
    Quote Originally Posted by sprayedenali View Post
    Nope
    why not?is it a 14 bolt?

  7. #7
    Join Date
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    the carrier SHOULD work on the OBS(don't quote me) they are the same for the 8.5(rear drums) and 8.6 (rear disc). The axles are different, but the center should be the same. I'm not 100% positive
    blown transmissions are about as useful as 97% of the guys on this forum

  8. #8
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    bearings are different. Go to Auburngear.com or something like that and they may list the bearing you need to use to put a NBS carrier in a OBS rear. BTW, the NBS rears are quite a bit beefier.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  9. #9
    Join Date
    Jan 2009
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    El centro, Ca.
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    129
    PMed you.
    2005 Silverado 4x4, 6" RCD lift, M/T Classic locks on BFG KM2's, 4:56 gears, Air-raid CAI, TB spacer, Nelson tuned, Corvette servos, 160 thermostat, Ebay long tube headers, Flowmaster Delta 40, Cognito Motorsports steering upgrades. 2000 Ford Lightning, 2.3 KB, bolt ons, 7.67 on the 1/8th.

  10. #10
    Join Date
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    Paris
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    coming off the top of my head, the axle spline count changed in the 8.5 rears in trucks in '88, and in i believe '91 in suburbans and blazers.. when they went from the old school square to the early 90's body style.. the '88 up OBS and NBS axle spline counts are the same.. in '99 the 10 bolt rear end became the 8.6 from the 8.5.. it utilizes larger bearings on the carrier.. the ring and pinions are all the same for 8.5 and 8.6.. like mentioned above, you can use different bearings to make the carriers interchangeable..

    not hi-jacking, just gonna throw out a lil bit of info.. i hope its correct..
    Truck: 05 GMC CCSB SLT Z71,
    Go Faster: 5.3, 219/227 .607/.614 112, milled heads, eBay CAI, Circle D 2800, 3030 Built 60E, E-Fans, 3030 Tuned, LT's, Spintech Muffler, DuraGrip w/ 3.73's
    Look Better: 10K HID's lows & fogs, tinted Chevy tails

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