Maybe you can easy stack Cisco 3750 switch in an easy way:
Stack in each by Cisco in Catalyst in 3750 series switches which are owned by a single IP address, and as a unified object management. A single IP management applied to fault detection, virtual LAN (VLAN) to create and change, security and QoS control and other activities. Each stack only a configuration file, which will be distributed to all members in the stack. This allows each switch in the stack can network topology, sharing the same medium access control (MAC) address and routing information.
Step 1: Configure one of the switches to have a higher priority so to know exactly who the master is on a switch stack.
Switch#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#switch 2 priority 15
Changing the Switch Priority of Switch Number 2 to 15
Do you want to continue?[confirm]
New Priority has been set successfully
Step 2: Configure it to match physical and logical view of the stack.
Switch(config)#switch 2 renumber 1
WARNING: Changing the switch number may result in a configuration change for that switch.
The interface configuration associated with the old switch number will remain as a provisioned configuration.
Do you want to continue?[confirm]
Changing Switch Number 2 to Switch Number 1
New Switch Number will be effective after next reboot
As you may have guessed, you can’t have two switches with the same number so you have to change the remaining switches in the stack. If your stack contains nine switches, then knowing the switch number is important so you can renumber the right switch. To do this easily, you press the mode button of the switch until the stack LED lights up.
Switch(config)#switch 1 renumber 2
WARNING: Changing the switch number may result in a configuration change for that switch.
The interface configuration associated with the old switch number will remain as a provisioned configuration.
Do you want to continue?[confirm]
Changing Switch Number 1 to Switch Number 2
New Switch Number will be effective after next reboot
Step 4: Once everything has been renumbered, it’s time to reboot the stack. When the stack is fully booted, verify the switch stack to make sure that everything is what you desire it to be.
Switch>sho switch
Switch/Stack Mac Address : a493.4cd6.5b80
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
*1 Master a493.4cd6.5b80 15 1 Ready
2 Member d867.d990.bb80 1 1 Ready