timing belt/water pump hasn't been done yet, should i be concern?

 

Are you sure it has a timing belt. None of Lexus vehicles that I have owned have a timing belt. They all have timing chains. Have had GS SC LS and GX.

 

It has a Timing chain. Out of my 2011 manual.

 

oh i didn't know that, for some reason i thought they had timing belt

so what's involve int he 90k maintenance and how much does that usually cost?

 

The 4.7 V8 in the previous generation GX and LX had a timing belt so you're not too far off.

I haven't looked that far ahead on mine, but I'm sure it's posted somewhere online. Without the timing belt to address, it's probably minimal (relatively speaking).