I use an 03 2500hd (130k), and a 01 f250 (93k) for landscaping and plowing. I just had both transmission fluid completely drained, ran a cleaner through it, and filter/gasket replaced. Now, from reading posts on here guys say not to completely drain it. I was originally thinking to drain the 6qts and filter every year, and do the entire fluid every 2-4. what do you guys think? should i stay away from draining the 20 some qts all-together? Thank you.
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