where is transmission fluid going?

2002 FORD F-350
119,000 MILES • V8 • 4WD • AUTOMATIC
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SILVER BUCK
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when i pull a heavy load with my pickup i lose a lot of fluid? load=10,000 lbs period of time= the last 2 months quantity= 7 quarts problem= there is no visible fluid under my truck, it completely dry?
Oct 20, 2009 at 3:44 PM
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KASEKENNY
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If there are no leaks then we most likely have an issue with the input shaft seal to the transfer case.

Basically the input seal keeps the transmission fluid in the transmission but I would remove the fill plug and see how much fluid comes out.

Clearly there should be no fluid coming out of the fill plug so if there is then that is where the fluid is going and the transfer case needs to be removed and replace the seal.

Please see the info below on how to check the fluid. Please let us know if you have questions on this. Thanks
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Aug 25, 2021 at 2:25 PM