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tranny identification

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by apollo, Nov 16, 2000.

  1. apollo

    apollo Newbie

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    Nov 16, 2000
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    I read the specs sheets and understand that my 84 k5 either comes with a
    th350 or a 700r4. I bought it used and am not sure which one it is. My
    question is how do I know which one it is?
    The original engine (305) was swapped in favor of a 350. The
    shifting arm on the steering counsel does not line up with what is displayed.
    ( I dont know what gear im in) It seems like I only have a reverse, and one
    forward gear. Is it safe to assume that it has only drive and not overdrive?
     
  2. blazen91

    blazen91 1/2 ton status

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    Location:
    Hesperia, Ca 92345
    The easiest way to tell is to count the bolts and look at the pan:
    700r4- 16 bolts, square pan
    400- 13 bolts, odd shape
    300- 13 bolts, sqare pan with one corner missing
    (if the count on the bolts is off, sorry I was going by factory drawn pictures)

    blazen91
    Protect the land FOR the people
    <font color=red>Not FROM the people</font color=red>
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Location:
    Cochrane, Alberta, Canada
    Take your truck out somewhere where you can comfortably accelerate up to and over 55mph. Put your truck into gear in the first position to the right of neutral. Hit the gas and count your shifts- you should be able to feel 1st to 2nd, 2nd to 3rd, 3rd when your torque convertor locks up, and if you have OD, it should be obvious when your tranny drops into overdrive. Of course, if you're willing to crawl under your truck, Blazen91's answer will take alot less time and save you some gas too!!!
     

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