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Welded vs Positrac

Discussion in 'The Garage' started by 68MUDSTUD, Jun 13, 2006.

  1. 68MUDSTUD

    68MUDSTUD OCD with shiny things

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    bigblaze made me think of this question... what are the differences between these? (besides Price)
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Posi equals some grip , but still slip . Welded equals no slip and grip is dictated by the surface of obstacle and tires .

    Posi drives easier . welded is gonna chirp and bark around EVERY corner and chew the tires up quicker .
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    They are not really on the same level traction wise. A welded diff is more comparable to a locker not a positrac. Positrac is like Pauly said. It will give you some extra grip over an open diff. A locker will give you 100% of the available grip & the same is true with a welded.

    A positrac will only transfer some power to the wheel that has traction. A locker give the wheel with traction all the power.

    Scenario:

    You have one tire on your rear axle stuck in the mud on the side of the road. You have the other tire still on the pavement.

    Open will just let the tire in the mud spin.
    Posi will send SOME power to the tire on the pavement to help get you out but the tire in the mud will still spin
    Locker will give Full power to the tire on the pavement.
    Welded is same as locker.

    Harley
     
  4. 68MUDSTUD

    68MUDSTUD OCD with shiny things

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    thanks guys, now i got er straight, but why does GM put on the glovebox "Locking Rear Differential" if all it is is posi, any explantaion for that please?
     
  5. sandawgk5

    sandawgk5 3/4 ton status

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    Because when you spin the other tire fast enough a mechanism in the dif actually locks the side gears together and that is when they like to go BOOM!!!:D Hence the name Gov-Bomb. And yes they are still using the same design in todays axles.

    Ira
     
  6. 68MUDSTUD

    68MUDSTUD OCD with shiny things

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    sweet, thanks guys, (and gals) its actually straight in my head now... ive been wondering about that for quite a while
     

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