by v8victor on Sun, 27 Nov 2011 6:22 +0000
Hi, i have a 3l d4d manual hilux over here in the uk, i have had it from new, its a 2007 model, when cold the gearbox rattles as discribed, when the clutch pedal is pressed the noise goes, when hot there is no noise, also if you apply a little pressure forwards to the gear lever when in neutral at idle the noise goes as it does if you raise the idle speed a little, personally (based on over 30years repairing cars etc) i believe it is down to clearance when cold on one of the gearbox shafts creating "backlash" which becomes correct when the box is warm hence no noise then, i have changed the oil a couple of times and added "slick 50" friction reducer but it did not improve it.
whilst it is annoying i do not believe it will become a problem as i have heard other makes of commercial gearboxes that make the noise all the time. i have mentioned it to a couple of toyota dealers but they do not have a solution to it.
also when the truck was new it developed the injector rattle and had a fresh set fitted so i am not confusing noises. hope the above helps, Geoff.