What brand ATF do you guys recommend for my 97 F250 HD 2WD? The truck has 258K miles showing on the odometer and is bone stock right down to the original converter and muffler. The fluid is not burnt smelling but is more of a brownish color than red. The trans has a crisp shift from 1st to 2nd but has a slipping type shift from 2nd to 3rd unless I'm accelerating hard and then it shifts normal. Is there an adjustment that I can make on a band or something if I drop the valve body to tighten it all up? Also is it possible to drain the fluid from the converter without pulling the trans? I have seen drain plugs on stock converters behind gas engines is why I ask? Another also, how is the best way to flush the entire trans without pulling it? I very seldom tow anything with this truck except maybe a bass boat or an old muscle car to restore. Any and all info is greatly appreciated!