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1984 GMC C3500 leak

Tiny
TIM KELLEY
  • MEMBER
  • 1984 GMC C3500
  • V8
  • 2WD
  • AUTOMATIC
  • 186,000 MILES
I have a leak in my transmission. It is from a small hole on the top and toward the back of the transmission it looks as though their is suppose to be some sort of plastic plug or something in there it is slightly smaller around than a #2 pencil
Saturday, February 21st, 2009 AT 5:41 PM

1 Reply

Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hi Tim,

Yes, there is suppose to be a plastic vent plug there. You may need to go to the dealer and see if they can get a new one for you. But, I don't think it should be leaking unless the tranny is over full. None the less there needs to be a vent plug so that water and debri doesn't get into the tranny. And No you cannot just plug the hole. If not vented it will cause tranny problems because it won't be able to breathe.

.
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Saturday, February 21st, 2009 AT 6:12 PM

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