Different IPs for DHCP and DNS on same grid manager?

[#1]

Is this possible or will we have to setup a new infoblox server? 

[#2]

Are you wanting to run GM, DNS, and DHCP from the same appliance, but service DNS and DHCP from different IPs?

[#3]

Yeah. We are trying to migrate our DHCP without changing IP Helper on all our SVI

[#4]

This seems kind of obvious, and perhaps missing the point, but you can run DHCP on the LAN2 interface.   Gives you a different IP address.   Just make sure you add appropiate static routes in the advanced network section of member configuration.   Defaults are always LAN1