i have an 89 gmc r3500 that i believe has around 300000 miles but not sure because of the odometer only shows 5 digits.ive had it about 6 years now havent put alot of miles on it.should i change filter and fluid or leave it?ive read if it hasnt been change in a while and you change it it will ruin the trans.
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should i change my trans fluid
- Thread starter wes104
- Start date
Will L.
Well-Known Member
Best is changing every 30,000 miles. Buying a truck used with 250k on it - finding out if the previous owner did it or not is crucial.
It is always a good idea for a new filter, but it the fluid has not been changed in 100k or more, reuse the old fluid. New fluid has detergent in it that can be the deathnail to the clutches. At a napa near me, they sold a non detergent dextron3 I had good results when topping off, but no one around here sells
It anymore.
At 300,000- the trans isn’t going to last a lot longer no matter what you do. Start shopping/ saving now.
It is always a good idea for a new filter, but it the fluid has not been changed in 100k or more, reuse the old fluid. New fluid has detergent in it that can be the deathnail to the clutches. At a napa near me, they sold a non detergent dextron3 I had good results when topping off, but no one around here sells
It anymore.
At 300,000- the trans isn’t going to last a lot longer no matter what you do. Start shopping/ saving now.