with the MFU make sure your batteries are all good, as ones with a dead cell will probably play up on you... I have a 1400 Mah Nicad that I've earmarked as not to go back in my truck (metallic Jade Green Knight Hauler) again... but will probably still be okay for my Juggernaut 2 and TXT-1..
said battery ran okay for a few minutes then shut down and the clearance lights were flashing and I thought my MFU had blown up... so I charged up a battery up and it was right as rain! YAY!
that being said I am using the Futaba 4VWD radio gear... went for something simple.... but might change in the future...