how often should i change the auto transmission fluid in my 1979 chevy truck ?

devil weed

New member
i bought this truck and it still has under 100000 miles on it, i changed the oil and did alot of tune up work, i looked at the transmission fluid on the stick and it looks good, and the truck shifts and drives good and does not make any strange noises, i dont no if i should change it or not, is there filters to change to like when you change the oil ? this is the first car i ever had with a auto transmission,
 
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