Cisco Firewall :: 6509 -Creating FWSM Intra-Chassis Redundancy

Currently we have two inter-chassis FWSM redundancy. I would like to configure them for intra-chassis.
 
Both FWSM's are in slot 7 of 6509 switches and i want to take secondary out from one of the 6509 switch and insert in the slot 3 of primary switch.
 
I addedd the following commands in my primary switch.
 
There were commands already present for FWSM in primary switch
 
firewall multiple-vlan-interfaces
firewall module 7 vlan-group 1
firewall vlan-group 1  2,3,777
 
to create intra-chassis redundancy i addedd the following command also there.
 
firewall module 3 vlan-group 1
 
after adding that, my firewalls worked fine but there was a issue with site loading. People from outside were able to access inside but from inside, we were not able to go outside.
 
do we need to clear arp from both FWSM's ? is there any other precautionary step, which we need to follow while working on it.