Hi everyone, new member here. I recently purchased a mid ninety's (I think), T5c. It has been setting for several years without being used. I got it running, cleaned fuel tank, changed engine oil, changed hydraulic oil (15-40) and greased everything I could find. I would like to change the rear end oil, can anyone tell me what to refill it with? I'm guessing 75-90 weight oil? thanks in advance.