Maybe problem with TRD shock absorber and springs

[jondee86]

OEM (factory) springs are something like 1.9/2.0kg/mm front/rear. You
probably have the classic "drift" springs of 8.0/6.0kg/mm. I have about
3.2/3.0kg/mm and that is acceptable for rough roads.

At a guess I would say 4.5/4.0kg/mm is about the limit for rough roads
if you have to drive more than a km or two. Of course, there are people
who will say that 8/6 is comfortable.... So you either have to get used
to your teeth rattling, or look for some softer springs.

Cheers... jondee86