i was running my tower terror MT today and noticed a few problems.

first
when it was running it was powerful and responsive but i noticed when going up a hill or under heavy load it will shut off?

second
and my main concern, the truck wont roll forward or back!
all wheels will move, motor turns over easy and runs. it seems the gears wont move. checked the break its not engaged so im at a loss for ideas here... how bout you?