Noise in Hilux

Hi there Alan, I have the exact same vehicle my'n has 275 on the clock have the slightest wine in 3rd gear can only just hear it if you are listening for it cant hear it over the radio or if the air con is on. You dont say if it is there through all the geras or just a certain gear. Possibly coming from the diff. I have known a few hilux's to get very noisy diffs especiaaly when the klms start to get high. My has no diff noise but am pulling the diff centre out in a couple of weeks as it has sprung a slight leak only a drop a week but am getting the limo tightened up and new wheel bearings and new diff bearings as well.Costing $500 including parts thats with me pulling apart and sending the diff away + axles.I would say that it's possibly the diff if its there in all gears if only when in a certain gear than I would say the gearbox. I have never heard of uni joints causing a whine, if they are a bit how you going they would be clunking or possible vibrations.Let us know how you go. Regards Steve M