Advice on Transmission Fluid Change for 1980 C10

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Grit dog

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Location
Auburn, Washington
First Name
Todd
Truck Year
1986, 1977
Truck Model
K20, C10
Engine Size
454, 350
If it’s operating fine then absolutely change it. Sounds like a good truck if it’s never been apart and still is truckin.

If you don’t pump it out the cooler lines to get the majority of old out, I’d get a pan with a drain plug and change it about 4x depending how much comes out. That’ll effectively replace about 90% of it.
 

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