I have toyota cr42 auto transmition. Sometimes engine should go higher rpm for gear changes, and i checked it with a mechanic and he told me, that i should change auto transmition oil and some filters, what is the fact of there filters, can it clean with any guarage or need special tools.. The gearbox was replaced in two months ago, and it cost me Rs.45,000. Is it the price of it, or what? Please give me some advice about this.. It really helpfull