Thanks. I am not experiencing any steering/handling problems. I had the 90,000 miles service done (including timing belt replacement) at this mechanic 2 months back. He test drove the van and suggested this repair. He has charged me $350 for timing belt, which I thought reasonable price.
I am also not sure how urgent this replacement, and the mechanic has no concrete answer. As you suggested I should take one or two more opinions.
Thanks