I recently purchased a 1991 Suzuki Carry 4WD 5 speed standard. It has a 660cc engine in it. The truck is structurally/ mechanically immaculate. I've changed the oil/oil filter/air filter and put a 2" lift kit on it(had to to put ATV tires on it). I know the differentials will take 90W gear oil but I'm not sure what the transmission will take for a lubricant. I have a service manual that has been translated to English but all it tells you how to do is rebuild the motor, transmission, change brakes etc... It has no recommendation as far as types of products, capacities, etc. I have a Japanese version that looks to be more complete and I saw where the oil had been changed a couple times in the past and made out "10W-30 but other than that, everything is written in Japanese. I haven't yet looked to see where to check/add transmission fluid to the thing. I guess what I'm asking is...Is there anyone on here that knows much about these things and can you help me out?