This is a common complaint with Tacomas. It has been present for several generations. See for yourself with an internet search. Dealers play dumb and suggest cleaning them. It doesn't work. I upgraded my rear shocks and the squeak is the same. Again, it's well known that the plastic pieces on the leaf springs cause the noise. It is loud, annoying, and make a brand new truck sound like a rusty farm truck. Unless more people complain, they'll just continue shrugging their shoulders.

Wonder what brand of rear shocks Toyota installed? Squeaking shocks is not a virtue of Toyota quality.

This truck has been squeaking we took it to the dealer as we saw it was a known issue they lubed the suspension well needless to say it is back to squeaking again and as stated before squeaks louder than the radio very annoying. I am ready to trade this truck in for a different truck very dissatisified with this Toyota will never buy another one.

My truck hasn't even had its first service yet and both rear leaf springs need to be replaced. They squeak so loud you can hear it over your music. Apparently the silencers went bad and they said they could break and potentially damage fuel tank.