Disappearing Transmission Fluid - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 01-20-2008
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Icon4 Disappearing Transmission Fluid

I'm the second owner of a 160,000- mile 1994 Ranger XLT, regular cab with short box, 4.0 L OHV V-6 with a 4sp-OD automatic. A few months ago, it began shifting improperly and not engaging in gear properly, especially when cold, first thing in the morning. Checked the transmission fluid and found it about 1-quart low, but color and cleanliness were good. I had been advised that it had been changed religiously at 12,000 to 15,000 intervals since new. The 4.0 OHV V6 has never needed oil added between 3,000-mile changes, so I began focusing on the transmission and neglecting oil checks. While ignoring the engine oil level and adding about a quart of transmission fluid per 500 miles, I continued musing about where the fluid was going. Carefully watching parking areas, and even inspecting from underneath the vehicle for any sign of leakage, I found none. I just kept adding transmission fluid as necessary, too busy to think much about it, but still bothered about where the fluid was going. When Christmas came and I was planning a short highway trip to visit my family, I returned to my regular habit of checking all fluids. I found the engine oil level a couple of inches over full . . . the missing transmission fluid. The vacuum modulator for the transmission had developed a diaphragm leak and was siphoning transmission fluid into the intake system, with it eventually ending up in the engine oil. A new transmission modulator solved the problem(s), and the transmission fluids and engine oil stay in their respective places. In addition, shifting is better than I've ever experienced with this vehicle.
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Old 01-20-2008
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might have a leak inside the radiator....check the antifreexe
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Old 01-20-2008
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very common problem with the A4LD trans. check all your vacuum lines at the manifold T also as trans fluid will swell them and they may come off.
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Old 01-20-2008
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Thanks for the replies. I just wanted to alert others of this malady. Everything seems fine now. A cheap and simple fix for a mis-acting transmission. Wish all problems were so simple. Lesson learned: Keep checking all of your fluids regularly.
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Old 01-20-2008
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If it was going into the intake it should have been putting out a white cloud of smoke as you drove. I'm sure you've drove behind someone with white smoke rolling out the exhaust. Most times it's the modulator diaphram.
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