Q: transmission on 1996 Nissan Quest

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
car shifts very hard won't shift until you reach 3500rpm out of low gear or any other gear. What could be the problem, has 157,000 miles, is it worth fixing

(1) Answer
You probably have a transmission line pressure problem. It may be easy to fix, but at 157k miles, if the transmission hasn't been adequately serviced or overhauled in the past you may end up needing a transmission overhaul because of the high mileage for an automatic. Go to a Nissan specialist or a transmission shop and get a diagnosis, it could cost you an hour's labor time but it would be worth it to know whether you want to fix it.
If you want to find a specialist, here's a directory link for you: