I have come to know that flushing without filter changes is an acceptable practice among reputable shops. Their theory if there are particles in the trans, you have bigger issues than a fluid change would fix. Some will change out the filter after 120k or so. But most part, they will not change a filter for the first 100k or so if the trans was flushed regularly.

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1983 123.133 California
- GreaseCar Veg System