hi my jeep iscj7 1983 258cdi with t4 manualtransmission i always use SAE 80W90 gearoil forlongtime but i haveseen chilton's automotivebook they side t4-t5 transimssion use Dexron 2 ???so ihave to changefiuld ?? thankyou. <img src="/forums/images/graemlins/confused.gif" alt="" /> <img src="/forums/images/graemlins/frown.gif" alt="" />