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5r55 hisses


nesbit

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2003
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I hear a hissing noise coming from the transmission "area" when i select either drive or reverse. Sounds similar to an air leak. Worse when warm. Can hear it at idle when stopped.

Otherwise the transmission seems ok. I checked fluid level and it's fine. I've read similar posts on the net, but no real conclusions to the problem.

2003 xlt 4x4 with 27k miles.

Any ideas?

Thanks!
 


fangotango306

fangotango306

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i just rebuilt a 5r55 in my wifes explorer because the OD planet exploded. on first drive i experienced the "hiss" while in reverse and drive with foot on the brake. i re adjusted the intermediate band and it went a way. however, this is not the kind of thing that will happen by it self. you dont seem to have enough miles on your truck to worry about servo bore wear either. i would find a transmission shop that knows the 5R55's and have it checked out. these transmissions are touchy and can be expensive to fix.
 

nesbit

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Transmission
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Hi fangotango306,

Thanks for the reply. I just noticed it the other day. As you can guess by the mileage I don't use the truck often. But I do run it every week or so to keep things lubricated.

Since it only hisses in gear I assume it's the transmission but I would have to let a shop confirm that. I guess it's possible it could be a head gasket leak but I doubt that would be sensitive to gear position...
 
fangotango306

fangotango306

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Engine Size
None yet
Transmission
Automatic
very doubtful that its a head gasket with that low of miles, unless you are very hard on the truck. If you are not a mechanic or comfortable with your own diagnosis i would still stick with the recommendation of taking it to a shop/dealer. I have run into a lot of strange things on vehicles. I've been working on my own junk for 20 yrs. sometimes it has saved me tons and sometimes i have replaced the wrong thing and over spent when i needed something else..
 
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