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Whose seen these tranny's

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CaveBlazin, Jun 21, 2002.

  1. CaveBlazin

    CaveBlazin 1/2 ton status Premium Member

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    Whose seen these tranny\'s

    SM318/SM326/SM330/T-89A/T-150 3 spd. (2.47-3.50:1 First Gear)
    Whats the story with these trannys and how do you tell them all apart? And are they any good. Ive got a buddy who thinks he has one and was curious how do you tell which is which.....
     
  2. CaveBlazin

    CaveBlazin 1/2 ton status Premium Member

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    Re: Whose seen these tranny\'s

    37 people so far and none have seen or know anything about these transmissions WOW these must be rare and ancient...
     
  3. pr1aw

    pr1aw 1/2 ton status

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    Re: Whose seen these tranny\'s

    They ran a T-150 in a Jeep that I know of. The others?????
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Whose seen these tranny\'s

    Yep, I saw that you already have the ultimate 4 spd, didn't figure you needed any help in knowing what is good ; )
     
  5. CaveBlazin

    CaveBlazin 1/2 ton status Premium Member

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    Re: Whose seen these tranny\'s

    Don't know if you guys know but these transmissions come stock in alot of K5 Blazers but how do you tell which one you have. O yea and your right Dorian I do have the good one and wont let it go my buddy wants it but he's gonna have to go else were to get it. hehehehehe
     
  6. Jeff427

    Jeff427 1/2 ton status

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    Re: Whose seen these tranny\'s

    </font><blockquote><font class="small">In reply to:</font><hr />
    SM318/SM326/SM330/T-89A/T-150 3 spd. (2.47-3.50:1 First Gear)


    [/ QUOTE ]
    My 77 has one of them because it shifts on the column, but heck if I know how to tell which one it is. I would assume the SM trannies would be the most common being they are Saginaw trannies. I would be interested in finding out more about the one I have too.
     
  7. HarryH3

    HarryH3 1 ton status Author

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    Re: Whose seen these tranny\'s

    They're pretty rare in K5's and highly UNdesirable due to the lack of a granny low gear. /forums/images/icons/wink.gif I think that the 3-speed tranny was the trans that came on a totally stripped, no-options K5 back in the early days. But most seem to have come with either an auto trans or a 4-speed manual instead. I've been messing with K5's since around 1976 and I've never even seen a 3-speed manual trans in a K5! /forums/images/icons/shocked.gif

    I did a Google search on the SM318 and came up with a list of transmissions for some pretty old trucks at: http://home.cshore.com/djcvjc/1955-59gmcguide.html Looks like a pretty ancient design! /forums/images/icons/shocked.gif

    The oldest shop manual that I've got is for 74's, but it doesn't give models numbers for the 3-speed manual. It just says that there was a Muncie version and a Saginaw version.
     
  8. CaveBlazin

    CaveBlazin 1/2 ton status Premium Member

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    Re: Whose seen these tranny\'s

    Thanks for the info I could'nt get the link to work but thats ok. My buddy has a 84 I think and he has a 3 speed thats why we are trying to figure what kind it is it's pretty crappy....
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Whose seen these tranny\'s

    At least in '82, there were only aout 3 manual trannies available for the whole C/K line. A 3spd HD, a 4spd HD (although I *thought* the 3 spd was considered even heavier duty) and a "car" tranny, which looks like a 4 spd Saginaw to me.
    I'm not looking in my service manual, thats just what i remember, I've seen exactly *1* "car" tranny equipped truck (4wd with 208 at that!!) in my 'yard excursions, and have only seen a few column shifted trannies...

    I doubt if GM used more than 5 different manual transmissions in these trucks from '73 on, but I guess on the 1st gens, there was a bigger selection of bad trannies to choose from lol : ) Besides, at that time, you could order just about anything you wanted, instead of being forced into the "package" deal like the later ones. (two tranny choices, woohoo)
     
  10. CaveBlazin

    CaveBlazin 1/2 ton status Premium Member

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    Re: Whose seen these tranny\'s

    Anyone got pics of a saginaw trannie cause Im confused with the wording is it the brand or what????
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Whose seen these tranny\'s

    I use "saginaw" as the description for the light duty car 4 speed. Time was, you could only get either a Muncie 4 speed, or a "saginaw" 4 speed, which was the weak one. (light duty I'm sure GM called it) Anyways, the saginaw I'm talking of uses a cast iron case, with external shift linkage.

    I'm sure the generic terminology doesn't help, but thats just what I know them as.
     
  12. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    Re: Whose seen these tranny\'s

    SM? thought they were muncie.....?
    maybe i am wrong...
    maybe its saginaw muncie....
    i dunno
    grant
     
  13. Blazer1970

    Blazer1970 1/2 ton status

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    Re: Whose seen these tranny\'s

    "Saginaw" trannies were made by GMs Saginaw division, same division that makes steering gears and pumps. Most of the column shifted 3 speeds were Saginaw trannies. As others have noted, there was also a Saginaw 4 speed used in some applications.
     

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