hi ! here's my problem,

last week umakyat kmi ng bagiuo via marcos hiway dala ang rvr ng friend ko bagong bili at second hand condition.while on our way up ung automatic transmission ng ride namin nag overheat signaling on the dash"A/T High temp".tinigil ko muna un car then i'let it cool down for 15 min then nawala un ilaw.pagdating sa city,pina check namin agad sa shop pero di naman expert sa auto tranny.kaya nag suggest ako sa kanila na i drain nalang un ATF at palitan.After removing the pan,masyadong marumi un ATF maraming sludge na makikita sa pan kulay "gray" at dumidikit sa filter magnets.Un suction filter barado narin.Wala kaming makitang auto supply dito kaya pinalinisan ko nalng ang filter ng gasoline.After cleaning,new ATF was refilled up to normal level(shell atf).

After that I test drive the car and everything went back to normal.Walang delays and slipping but after about 20kms driving,ayaw na gumana,kahit sa 1st,2nd & drive parang na sa neutral nalang lagi.pero if i turn off the engine for 1 min,balik naman sa normal then about 100 meters drive wala na naman engagement. iniwan nalang namin ang car sa friend ko sa la union.by the way my friend's ride is Mitsubishi RVR automatic diesel .

pareho panaman kami ng sasakyan kaya worried narin ako baka mangyari rin sa ride ko ang ganitong prob.

ano kaya ang cause nito? need help from you guys.

thanks in advance..