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axle/tranny ID

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 76K5, Jun 28, 2001.

  1. 76K5

    76K5 Registered Member

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    I have a 76 K5. My first question is how to identify between the 350/400 tranny's and what are the differences between them strength wise. My other question is the rear end is a 12 bolt, but how can I tell if it is limited slip. I bought the car from the original owner who still had the window sticker. Would that option be listed on the window sticker?

    If in doubt, gun it.
     
  2. Thunder

    Thunder 3/4 ton status

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    Look at the oil pan on the tranny. If it is looks like a square with one corner cut off it is a 350. The TH400s oil pan is not square. The TH 400 is suposed to be stronger. But the 350 is also a very good trany.
    The orignal window sticker should say if it has a limited slip(guv-lock) rear axle. It should be listed under the options. If not look at the rear end cover it may still have a tag attached to one of the bolts identifing it.
    Or jack up the rear end and spin both wheels by hand. If they both spin the same direction when one wheel is roated is is a limited slip. If one wheel spins forward and the other goes backward it is an open diff.

    <font color=orange>GOT HORSEPOWER?</font color=orange><P ID="edit"><FONT SIZE=-1>Edited by Thunder on 06/28/01 11:13 AM (server time).</FONT></P>
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Or just stand on the brakes and mash the go-pedal and look for even marks. :)

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  4. MudFrog

    MudFrog 1/2 ton status

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    I don't think blazers came with TH400's.

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</A>
     
  5. Executioner

    Executioner 1/2 ton status

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  6. Executioner

    Executioner 1/2 ton status

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    Wrong........
     
  7. HarryH3

    HarryH3 1 ton status Author

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    Turbo 400 oil pans are shaped sorta like the state of Texas. [​IMG] But they didn't come from the factory in K5's. Early K5's came with Turbo 350's while later models came with 700R4's. The original window sticker will list if there's a limited-slip installed in the rear, since it was available only as an extra-cost option. If it was ordered with an optional gear ratio in the axles, that will be listed on the sticker as well.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     

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