Hello traxxas people, so for Christmas I purchased my 8 year old son a traxxas 2wd brushed 2.4ghz chad edition slash. As we opened the box I was impressed how cool this truck looked, o sorry my boy was lol.. Ok so I went back to work the next day and on my way home I pick me up a traxxas slash 4x4 brushless. Me and my son went to local park to ride them as we did my boy was real quick to tell me that his truck was bobo cause mine was a lot faster bobo meaning sorry. So what I did was bought his a brushless set up velineon 3500kV brushless motor, a waterproof VXL-3s brushless ESC system. Installation was easy just a swap. As I went out for a test ride in my sons eyes his truck was beast, as it was killing all my grass pealing out. Now as I went about 40 feet the truck would cut off I had to get close to regain connection with radio. First I thought the batteries are dead on radio so I swapped with new ones no luck, next swapped truck battery with fresh one no luck, third checked connections on esc and little black box where plug goes from esc everything looked good. Light on esc is green I also followed some of the instructions that came with esc and set it to program one as you hold down button and red blinks once. Also im running lipo 2s 4000mah 20c, works perfect on my other slash and had also ran on this one before. Pls help it driving me crazy!