Im not sure why do would do this!
Your motor will heat up....most ESC and motors do heat up and this is quite usual. Methods to combat this include putting a heat sink on your ESC or motor
http://www.ebay.co.uk/itm/540-550-RC...#ht_2105wt_770
http://www.ebay.co.uk/itm/540-550-RC...item4cf4a4b152
You could also cut small vents in your shell to improve airflow.
Also look at your setup...are you geared right? What surface are you running on or are you just bashing?
Take the main shaft will affect handling and balance in the car. Some people use a front one-way which does effectively make your off-road 2wd but gives better steering. I'm not sure if this is available on the vantage.