How to redirect a port range on a load balancer

I’m a little new to this and trying to figure this out. I have 3 web servers running Ubuntu 16.04 and Apache2. One of the web servers will serve as a load balancer for the other two. I have the load balancing part correct, but I am trying to set this up where the port range 60000-65000 on the load balancer is redirected to the web servers on port 80. My guess is that this is done using iptables but that’s just a guess. Has anyone implemented this before? Thanks in advance.