Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Rear end odds?

Discussion in 'The Garage' started by MOBK5, Jul 3, 2005.

  1. MOBK5

    MOBK5 1/2 ton status

    Joined:
    Apr 5, 2005
    Posts:
    180
    Likes Received:
    0
    Location:
    MCAS Cherry Point, NC
    What are the odds of an 82 K5 with a 10bolt and a 79 K5 with a 12bolt having the same gears? I want to use an old 12 I have because it has a posi in it and me being 17 dont have the money to buy and locker and get it installed or mess up trying to install it for the 10 bolt and no money for a 14bff.
     
  2. LongIslander26

    LongIslander26 1/2 ton status

    Joined:
    Jun 25, 2005
    Posts:
    256
    Likes Received:
    0
    Location:
    Park County, Montana
    odds

    I'd say the odds are pretty good if niether one has an O/D tranny. If you know the ratio in yours, see if the tag is still on the one your looking at and it should give you the ratio. OR, if you can pull the cover, count the teeth on the ring and pinion gears and do the math, OR look on the build sheet in the glove box door, and see if it's listed there.
     
  3. MOBK5

    MOBK5 1/2 ton status

    Joined:
    Apr 5, 2005
    Posts:
    180
    Likes Received:
    0
    Location:
    MCAS Cherry Point, NC
    Both the blazers are mine, but one has no engine/tranny, has been up to the windsheild in mud. All the stickers with the stock parts are gone and the 82 has a 700r and the 79 had a th350.... Guess ill be counting teeht. I appreciate it.
     
  4. nvrenuf

    nvrenuf NONE shall pass! Premium Member

    Joined:
    Jan 7, 2002
    Posts:
    13,075
    Likes Received:
    245
    Location:
    Mobile, Al.
    Definitely count teeth but I'd bet both have 3.08's.
     
  5. LongIslander26

    LongIslander26 1/2 ton status

    Joined:
    Jun 25, 2005
    Posts:
    256
    Likes Received:
    0
    Location:
    Park County, Montana
    Rearend gears

    It's extremely possible the one with the 700-R4 has 3.42's, but you may get lucky. I hope you catch a break and get lucky. I remember being 17 and a car nut. (AND broke!) Let us know how you make out. :waytogo:
     
  6. gmcjimmy90

    gmcjimmy90 Registered Member

    Joined:
    Jul 3, 2005
    Posts:
    76
    Likes Received:
    0
    Location:
    arkansas
    i know mine 90 has the 700r4 and 3.42's and my buddy has an 85 with 3.42's
     
  7. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    od doesnt mean crap

    espcialyl in the full size rigs,

    its not like in the s-series where most all of them were 3.42 with 700r4


    youll have to pull diff covers to know for sure

    youre gambling/guessing here, completely, totally


    ratios in these axles included
    2.56, 2.73, 3.07, 3.40, 3.42, 3.73

    ive personally seen with my own eyes- with diff covers removed- at least one of all the above ratios, 70s and 80s years, 10s and 12s both, since 1993 when i started pulling trucks and cars in and apart and such

    and i have a collection of SPID labels that show all these ratios plus a few others, from full size GM trucks, 2 and 4 wheel drives,

    the odds of them being same would be like the odds of winning a lottery, or whatever else

    1 in however many of the axles they made


    good luck
     
  8. down4thakrown

    down4thakrown 1/2 ton status Premium Member GMOTM Winner

    Joined:
    Aug 5, 2003
    Posts:
    1,760
    Likes Received:
    75
    Location:
    flagstaff,az
    im guessin the 82 has 3.08 and 79 has 3.73 or 4.10
    i'd swap out both axles, you'll be able to tell a differance with the new ratio and posi
     
  9. Mad-Dog

    Mad-Dog 1/2 ton status

    Joined:
    Mar 20, 2005
    Posts:
    548
    Likes Received:
    0
    Location:
    Ocklawaha,Fl
    Slim to none.........the '79 has 3.07's, and the '82 will have 3.08's
    Place your bets ladies and gentleman..!
     

Share This Page