Drainbolts Muncie stuck!

Discussion in 'Transmission & Driveline Topics' started by Seemank, Mar 30, 2017.

  1. Seemank

    Seemank Member

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    Hello good people!

    Im trying to loose the oilbolts for draining and filling my '73 Muncie M21.
    They are completely stuck..Any tips? How bout threads, normal direction to loose/tight?
     
  2. Double J

    Double J Veteran Member

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    NPT thread Rigthy Tighty Lefty Loosey
     
  3. Dave Nelson

    Dave Nelson Veteran Member

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    Try a little heat, normal direction (counter clockwise) to remove.
     
  4. Seemank

    Seemank Member

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    Tnx, turned out it was just a question of brut force And now comes the next question: How is the old oil suppose to look like? It was a bit shimering and thick. Also some realy greasy stuff on the magnets on the oilplugs. No big bits, though.
     
  5. COPO

    COPO Veteran Member Lifetime Gold Member

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    Sounds normal. You will get filings from the shift fork wearing and the thrust washers. Thick stinky dark gear oil is the used look.
    [​IMG]
     
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  6. CorkyE

    CorkyE Veteran Member Lifetime Gold Member

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    That oil is 90W or more, so it's going to be thick, especially when drained cold.
     
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  7. Fbird

    Fbird Veteran Member Lifetime Gold Member

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    ah... the smell of sulfer....mmmmmm....

    btw the ONLY way to get rid of that WONERFUL smell...that you got on your shop pants.... ADD VINEGAR to your wash... ;)
     
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  8. COPO

    COPO Veteran Member Lifetime Gold Member

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    Factory is 80w90. Same oil gets in the rear axle + a bottle of posi additive if you have posi.
     
  9. Gary S

    Gary S Administrator Lifetime Gold Member

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    Similar oil. Tranny should have GL4 rated 80W-90 and rear end can use either GL4 or GL5 rated 80W-90.
     
  10. COPO

    COPO Veteran Member Lifetime Gold Member

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    I use GL4 and GM still sells it. I ran GL5 in my Muncie for many years with no ill effects to the GM syncros. The syncros still looked new so the
    tale about eating your syncros is a myth IMO.
     

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