I am facing a strange sound in my VITZ-05 REG in 08. Its while on Drive or Reverse, some thing like Bering sound, The sound start coming when for the first time I run my car on 160-165 KMH on Motorway just to check how fast it can run 
Toyota workshop people says its coming from gear box and its due to some Bering or belt.. They asking following expense..
1- Gear Box opening + fitting = 10000
2- Gear Oil cost - 4200
3- Gear Oil changing labor - 1000
4- Gear box parts that need to be repair or change - 20000 +/-
So its about 35 thousand +/-
All I want to know from any expert what I should do, what type of prob is this, any other workshop regarding repair or check it in LAHORE, Any VITZ expert??
My VITZ have done 59000 on ODI (CNG Never installed)