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Changing TH350 oil. What do you recommend?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazer79, Mar 1, 2001.

  1. Blazer79

    Blazer79 1/2 ton status

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    I'm about to replace the oil and filter on my TH350. Any particular oils you recommend? So far I've seen Quaker State, Texaco and Chevron out there. Anyone I should stay away from?

    Also, how much oil should I buy? I don't wanna be running back to the store again for more oil once I'm in the middle of the process.

    Is there a way I could "flush" out all the oil that remains inside by hooking a hose from an air compressor somewhere inside the tranny? Or am I looking into destroying my tranny by doing this? I know there are places that will do this, but wanted to try doing it myself.

    Thanks for your help.

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  2. muddin4fun

    muddin4fun 3/4 ton status

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    They make a drain plug you can put in the pan. But beware! It'll make you lazy so remember to replace the filter and the gasket. I go to Napa and get their tranny fluid. It works well. It's a good idea to put a tranny cooler on if you haven't already done so. it makes it last a lot longer. i don't remember how much fluid it takes though...

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  3. wayne

    wayne 3/4 ton status

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    I put a B&M deep pan on my TH350 in my 73 p-up and they reccomended using Ford ATF so I did, have not had any problems with it.

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  4. Boss

    Boss 1/2 ton status Author

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    I also put the B & M Deep pan, but used Mobil 1 ATF.
    Boss

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  5. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Fair warning. A tranny that has not been maintained through it's life and had fluid changed every 30k as recomended may fail after having it's fluid changed with high miles. Right now the fluid has paticles of clutch and metal suspended in the fluid. these particles may be all that's keeping hte tranny alive by providing enough friction to keep the clutches from slipping. New fluid will not have these particles. Be prepared for the posiblility that this will happen.

    Diging it in the dirt with my K5's
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  6. Sparky

    Sparky 1/2 ton status

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    ummm, this may sound obvious, but you kept calling it oil. I would highly recomend you put in tranny fluid and not oil. Just though i would make sure you know this. Only manual transmissions use oil. Did not mean to insult you if I did, but I have known a few people who would do it.


    When all else fails... Check the blinker fluid.
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  7. DMK

    DMK 1/2 ton status

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    It used to refered to as oil. In my 57 buicks owners manual it refers to tranny fluid as oil for the auto trans. Not sure when this changed. My 66 pontiacs manual says atf.
     
  8. Blazer79

    Blazer79 1/2 ton status

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    No offense taken, Sparky. I know that red ATF stuff is different than good 'ol motor oil. It's good on pancakes too [​IMG]j/k.

    Does anybody know the differences between Dexron, Mercon, etc?

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  9. Blazer79

    Blazer79 1/2 ton status

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    Thanks for the warning[​IMG]. The tranny was rebuild about 50K ago. My father (previous owner) thinks he did change it once after that, but not sure. What do you say? Should I change it? The current oil...um, ATF smells old. Not burned, just old.

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  10. DMK

    DMK 1/2 ton status

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    You should be okay if it has been changed within 50k.
     

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