transmission fluid leak

Asked by cmnjn Sep 20, 2007 at 07:37 PM about the 1994 Ford Explorer

Question type: Maintenance & Repair

First off sorry if this question posts 2x times, I tried to post it earlier but I didnt see it listed so am trying again.
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My transmission fluid is leaking into my engine/engine oil. There is not exterior leak. I was told its probably coming from the seal between the transmission and engine.

My questions are: Does that sound likely? What is the name of the seal between the transmission and engine? How hard is it to replace ~ can i do it with basic tools and a space to work in? If not any idea of the cost to have it done?

Thank you for the help!

3 Answers
4,585

joecorvair answered 17 years ago

Even if the front trans seal or the engine rear main seal were leaking, the fluids would not comingle. If you have a trans. vacuum modulator valve and it is leaking, the engine vacuum could pull trans. fluid into the motor.

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GuruD4F1R answered 7 years ago

If engine oil is going up and transmission fluid going down it is the vacuum modulator on the transmission. Transmission works off a vacuum from engine. When modulator goes bad the vacuum sucks trnany fluid into motor. Make sure pin is replaced when changing the vacuum modulator.

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