Just pulling the pan does not "flush the system" in fact alot of the fluid will still be in the converter. If you want it "flushed" you will need to take it to a shop, they can hook it to a machine and will get all the old fluid out. As far a the filter, just go to Napa and have them look it up. I think if you want a little firmer shift that can be accomplished with a tune, firmer than that get a shift kit and a tune...
99 silverado 2500 4x4 ec lb, lq4 with 243 heads, pace setter long tubes, true duals with x pipe and bullet mufflers, comp 222 224 112 cam, 8.1 truck injectors, 4l80e with 2800 stall, 373 gears, 285 75 16 tires, efi live tune in progress, 350rwhp 360tq, 11.8 average mpg mixed driving
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