I drove my '06 4x4 quad cab 100,000 miles and only changed the engine oil then the light said to. I also used Slick 50 twice about 30,000 mile intervals, I liked it so much I just bought an '11.
I would take it to transmission shop myself, for a flush and a filter it should be $100.00 - $200.00.
A rebuild would be around $700.00.
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