wondering what would have caused this

[Hammerhead]

(04-02-2017 )arch_stanton Wrote:  On the 3.90 being the wrong gear are they running too many rpm's, should they be running 3.50 or are you saying they too few rpm's and should have 4.11's

>60% torque load means RPM operating range is too low, should be running 4.30's or driving lessons.
That's the massive misconception with big torque motors, excessively using it is detrimental to longevity.
You're more likely to hurt a motor lugging it than you are spinning it.