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Manual trans

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by chris12, Sep 27, 2006.

  1. chris12

    chris12 1/2 ton status

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    Hi i have the SM manual trans in my 88 k-5 and i was wondering when i go down the road i get like a whirly noise coming from the trans but in 3rd gear it goes away. What could this be.
     
  2. sweetk30

    sweetk30 professional hooker Premium Member

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    huge gears and just a big old tranny with some play. a reman might help. but change the oil and run some oil additive if you want.
     
  3. imiceman44

    imiceman44 1 ton status

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    Could be one of the bearings inside, but maybe a change of oil and some additives will cure it.
    I put the heaviest gear oil plus the additives to make mine so quiet you'd think it's an auto. :D
     
  4. johnnychimpo

    johnnychimpo 1/2 ton status

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    What additives are you using?
     
  5. lamberthkp

    lamberthkp SITFU Premium Member

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    yes i would also like to know :D
     
  6. Chevy305

    Chevy305 6 Lug 14bsf Status Premium Member GMOTM Winner

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    I have been told by many people never to run additives in the SM465. It was designed for gear oil and only gear oil. Some new manual trannys run ATF or something similar, but that is not the best thing to run in an SM465.
     
  7. imiceman44

    imiceman44 1 ton status

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    What I used was what I found at Kragen at the time, dunno what it was.

    As for running additives or not, no manufacturer will tell you wether you should or should not put additives, they don't want to be liable for anything.
    And ATF was specified on mid 80's 465's that had the 241 or 208 behind them.
    I wouldn't but it was the original fluid to be used.
    Additives have come a long ways but there are also some bogus additives that could ruin your equipment.
    I wouldn't use teflon in engines again but in a tranny I might...
     
  8. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    I put extreme duty gear lube in, along with a bottle of that Lucas stuff that makes the oil climb the gears, and I have absolutely no syncro noises, or gear whine. Its almost strange driving that truck without it sounding like a school bus on a cold morning, lol

    Then again, I did totally overhaul both the transmission and transfercase, so maybe that is contributing as well :)
     
  9. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    atf in one ahead of a 208 is so that if a seal goes bad you dont have a gooey mix of atf and gear lube, a 208 will not work real well with that in it...
     

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