Coolant in transmission

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Chevyho, Apr 14, 2014.

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  1. Apr 14, 2014 #1
    Chevyho

    Chevyho Medium Load Member

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    Dropped my tranny fluid and there was coolant in it. Its a rtlo18913a, with cooler on top of trans. I am thinking Im going to go to a air to oil cooler mounted up front, most my previous trucks had this and never had a problem. Any tips to flush coolant out of trans? I was thinking just filling with 50W driving for a bit then dumping and putting my 50W synthetic in?
     
    Chevyho, Apr 14, 2014
    Chevyho, Apr 14, 2014
    #1
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  3. Apr 14, 2014 #2
    Cranky Yankee

    Cranky Yankee Cranky old ######

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    well as a man who has flushed out 4 transmissions on leaky boats
    all we ever did was drain fill drain fill 3-4 times
    never ran very long between changes
    everything up to temp be long enough
     
    Cranky Yankee, Apr 14, 2014
    Cranky Yankee, Apr 14, 2014
    #2
  4. Apr 14, 2014 #3
    wore out

    wore out Numbered Classic

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    Just going to an air cooler up front won't solve your trouble I don't think. You should have some heater hose size lines that hook to the tranny with coolant running thru them
     
    wore out, Apr 14, 2014
    wore out, Apr 14, 2014
    #3
  5. Apr 15, 2014 #4
    Chevyho

    Chevyho Medium Load Member

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    There is a cooler on top of tranny, 2 lines from trans circulate trans fluid through it. The cooler also has coolant circulating.. It is the only place the coolant and trans fluid can be mixing. The air cooler circulates trans fluid only, no place for coolant to mix with oil.
     
    Chevyho, Apr 15, 2014
    Chevyho, Apr 15, 2014
    #4
  7. Apr 15, 2014 #5
    Superhauler

    Superhauler TEACHER OF MEN

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    why not? I have converted all mine to an air cooler in front of radiator and never have had a heat problem. it will actually run cooler than a coolant cooler will.
     
    Superhauler, Apr 15, 2014
    Superhauler, Apr 15, 2014
    #5
    jamespmack, grizzly and Chevyho Thank this.
  8. Apr 15, 2014 #6
    Superhauler

    Superhauler TEACHER OF MEN

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    another thing to keep in the back of your head. if you had a lot of coolant in the trans grease be ready for a trans failure. it may not happen if you caught it in time. I know of one instances where enough coolant got in the trans that it was pushing the grease out of breather. 200 miles after fix trans took a dump!
     
    Superhauler, Apr 15, 2014
    Superhauler, Apr 15, 2014
    #6
  9. Apr 15, 2014 #7
    Chevyho

    Chevyho Medium Load Member

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    Yah hopefully caught it in time, thats why I want to flush it good.. Only reason i noticed it is because I dropped fluid to put a pto on.
     
    Chevyho, Apr 15, 2014
    Chevyho, Apr 15, 2014
    #7
  10. Apr 15, 2014 #8
    Chevyho

    Chevyho Medium Load Member

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    Am i better off running atf through it once or twice to clean in out?
     
    Chevyho, Apr 15, 2014
    Chevyho, Apr 15, 2014
    #8
  11. Apr 15, 2014 #9
    Superhauler

    Superhauler TEACHER OF MEN

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    NO! simply put.
     
    Superhauler, Apr 15, 2014
    Superhauler, Apr 15, 2014
    #9
  12. Apr 15, 2014 #10
    Chevyho

    Chevyho Medium Load Member

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    Just flush with 50w then?
     
    Chevyho, Apr 15, 2014
    Chevyho, Apr 15, 2014
    #10
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