Where'd the fluid go???
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Joined: Mar 2003
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Where'd the fluid go???
I just recently got a 97 F-150 with 4r70w transmission. Runs great, but gobbles up trans fluid at an amazing rate! Underbody inspection shows no leaks. Where could it be going? Any help would be greatly appreciated
Posting Guru
Joined: Dec 2002
Posts: 1,297
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From: Billings MT
Where'd the fluid go???
Vent tube? I think those are vented. If your vent tube is hanging down, you might try to fasten it so that the open end is up, and I would think it's supposed to have some kind of a plug like a differential vent tube does. There's really only 4 places for it to go and that is the pan, the output shaft, the fill hole, and the vent tube if there is one. OH, is there an overflow hole somewhere??? All of those will show residue somewhere, except if the vent tube is dripping while you are going down the road.
I'm not familiar with autos, only had one and that was years ago andit was a C-4 in a 67 stang that just drank fluid like a sailor swears and one day I was filling it up (measured empty) and it started pouring out of somewhere in the casing right in the driveway. So, I moved it, put a for sale sign in it and sold it in a week.
Maybe this helps, just a few thoughts.
I'm not familiar with autos, only had one and that was years ago andit was a C-4 in a 67 stang that just drank fluid like a sailor swears and one day I was filling it up (measured empty) and it started pouring out of somewhere in the casing right in the driveway. So, I moved it, put a for sale sign in it and sold it in a week.
Maybe this helps, just a few thoughts.
Elder User
Joined: Aug 2002
Posts: 886
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From: Cincinnati
Where'd the fluid go???
but there is one more place associated with transmission fluid loss. The vacuum modulator can leak and the fluid is sucked up into the intake manifold of the engine. Locate the vacuum tree on the engine and remove the tube that goes to the transmission. Inspect for signs of fluid.
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Where'd the fluid go???
OperaHW a 4R70W is basically an AODE.
They have no modulator so that's not your problem.
Is your truck a 4x4? If so the fluid could could be leaking past the transfer case input seal into the transfer case. If you pull the fluid level plug out of the transfer case and fluid comes gushing out you've found your leak.
If that's not it about the only place it can go is into the rad through the cooler. Your coolant in the rad should be milky and foamy if that's the case.
They have no modulator so that's not your problem.
Is your truck a 4x4? If so the fluid could could be leaking past the transfer case input seal into the transfer case. If you pull the fluid level plug out of the transfer case and fluid comes gushing out you've found your leak.
If that's not it about the only place it can go is into the rad through the cooler. Your coolant in the rad should be milky and foamy if that's the case.
Senior User
Joined: Oct 2001
Posts: 258
Likes: 1
From: Central Virginia
Where'd the fluid go???
Hi parkjam, if you have a 4x4 your fluid is likely going into the transfer case. Pull the transfer case's fill plug and the fluid will come pouring out. If that's what you find the transfer case front seal needs replacing.
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