in the front of my slash 2wd, there is a white bar ...it broke im not sure what it is and im new to this
Its called a tie bar, its purpose is to strengthen the bulkhead.
If the truck took a hard enough impact to break it the bulkhead may be cracked also, imo a good inspection may be in order.
If you go aluminum the tie bar isn't necessary but I still run one.
This truck has a green strc aluminum bulkhead and I still have the tie bar installed.