Change Transmission Oil

How often do i need to change the transmission oil? I never change it since i had vehicles. Color of transmission oil in both vehicles are still like dark red.


2000 Ford Expedition 180k miles
2003 Chevy Silverado 1/2 ton truck 150k miles
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Transmission fluid...follow your service book.
My Honda was 60K to the letter, for both transmission and rear differential fluid.
Found that out when 4WD was whining going around corners.
Best bet is to get the manual for the vehicle and check what it says.
The manufacturer's maintenance schedule for many automatic transmissions doesn't call for fresh fluid until 100,000 miles or, with some Ford transmissions, even 150,000 miles. A lot of mechanics say that is too long and it should be done at least every 50,000 miles. Manual transmissions may be on a different schedule, so it's best to consult the maintenance schedule in the owner's manual.

The 2000 Ford Expedition service manual says to change at 60,000 miles.

see the attached service manual pdf

2003 Chevy Silverado 1/2 ton truck service manual states to change from 25,000 to 50,000 miles depending on driving conditions.

See the attached service manual for details.
2003 Chevy Silverado 1/2 ton truck service manual states for an automatic transmission to change from 25,000 to 50,000 miles depending on driving conditions.

You have not stated you transmission, so I suggest that you:
See the attached service manual for your transmissions detailed service recommendations.

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