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GM Dana 70 dually rear... posi?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mountainexplorer, Nov 20, 2003.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    Did GM put very many posi Dana 70 rears in their 1-tons?

    I just got one and as I was pushing it into the driveway, turning sharp, I noticed the inner tire breaking loose (not slipping, but turning on the pavement as fast as the outer wheel for a while)
     
  2. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    I don't know but my C30 76' dually had both duals spinning last time I got it in some soft ground.
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I've heard that a lot of D70's got the Powr-Lok, which is a very good differential. Its the next posi-trac device better than the Track Lock. Where the TL has just a 2 spider pinion, the PL has 4 which is the reason for the strength. Nothing wrong with these posi's as long as the proper lube (posi lube) is added with the regular 80-90 weigth oil. /forums/images/graemlins/thumb.gif
     
  4. mountainexplorer

    mountainexplorer 1/2 ton status

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    Is it very easy to tell visually by pulling the cover while its still in the rig? What might I look for?

    Thanks.
     
  5. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    This is what a Power Lock will look like;

    [​IMG]
     
  6. reeser

    reeser 1/2 ton status

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    allan
    if it is indeed a power lock which as stated above is like 90% locker, it is my understanding that you can swap it into a front 60. with a power lock front and a detroit rear you'll be good to go. i wonder if the 4.10 gear set will effect what gear set you can run in the 60?
     
  7. SUBFAN

    SUBFAN 1/2 ton status

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    How is that D70 Power lock going to fit into that 60 front????
     

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