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.

Name this Posi Unit

Discussion in 'The Garage' started by mountainexplorer, Dec 16, 2006.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

    Joined:
    Nov 14, 2001
    Posts:
    4,903
    Likes Received:
    0
    Location:
    Spokane, Wa./Ione, Wa
    I was pleasantly surprised to find the '91 GMC Crew Cab I got had a Detroit Locker in the 14-bolt rear. The front 60 has spider gears but looks like clutches on the sides.

    Who can name what sort of Posi this is? (Pictures attached)

    DCP08007.JPG

    DCP08009.JPG

    DCP08010.JPG

    DCP08011.JPG

    DCP08008.JPG
     
  2. JEBSR

    JEBSR 1/2 ton status

    Joined:
    Dec 23, 2004
    Posts:
    1,541
    Likes Received:
    0
    Location:
    Clarksville, TN
    Thats what was in my 60 when I bought it, looks like an eaton unit to me but from what I can gather on the net Dana/Spicer makes it.
     
  3. walla2k5

    walla2k5 1/2 ton status

    Joined:
    Sep 5, 2004
    Posts:
    2,054
    Likes Received:
    1
    Location:
    Walla Walla, WA
    I had one like that on a 44. I think it's called a Trac-Loc or something.
     
  4. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    Yep thats a Trac-lok.
     
  5. b454rat

    b454rat 1/2 ton status Premium Member

    Joined:
    Jan 21, 2003
    Posts:
    3,009
    Likes Received:
    7
    Location:
    Binghamton NY
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
  7. mountainexplorer

    mountainexplorer 1/2 ton status

    Joined:
    Nov 14, 2001
    Posts:
    4,903
    Likes Received:
    0
    Location:
    Spokane, Wa./Ione, Wa
    It's a 3.73 ratio front. I'm thinking use it for my snow plow truck which won't run larger than 33" tires. I'm thinking turning 36-40" tires wouldn't be the best for a Trac Lock
     
  8. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    At least with that ratio, you can actually DRIVE it on freeway speeds.....
     
  9. mountainexplorer

    mountainexplorer 1/2 ton status

    Joined:
    Nov 14, 2001
    Posts:
    4,903
    Likes Received:
    0
    Location:
    Spokane, Wa./Ione, Wa
    yeah, if it was a stronger posi unit I was thinking of having to swap gears and all that to run it in one of the bigger trucks. But beings that it's 3.73's and already set up, I could swap it into my plow truck which is just a frame sitting here anyways.

    But the matching 3.73 rear has a Detroit which I'd rather not run with the plow truck. The current rear end is a Gov-Lok with 4.10s... I wonder if I could just switch ring and pinions... carrier's the same in a 14-bolt between 3.73 and 4.10 if I remember right... so I could put the 3.73 rear ring and pinion onto the current Gov Lok carrier and use the matched 3.73s in the plow truck, which would be a 454/TH400/205 and 33" tires or 235/85R16 studded snows in the winter.
     
  10. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    Thats actuallty intresting to see a 60 front with a trac-lok instead of a powr-lok.

    The problem with the trac-loks is that they break clutches, but im talking about in a rwd vehicle with 70K plus miles on it, such as Dodges with a 9 1/4" rear end. You'r 36's should be fine.
     
  11. mountainexplorer

    mountainexplorer 1/2 ton status

    Joined:
    Nov 14, 2001
    Posts:
    4,903
    Likes Received:
    0
    Location:
    Spokane, Wa./Ione, Wa
    It's probably not worth the hassle to tear it all apart and swap gears in it to run the Trac Loc in one of the trucks with bigger tires. I'd probably have to run 4.10s to be able to use the same carrier, or have to buy thick cut gears.

    And I'd probably find a way to break it with larger tires.
     

Share This Page