Novak HV 4.5 system problems

my hvmaxx 4.5 died after one run of 18/72(iirc)
no thermal at all
just recharged and went out to run and it was lurching, or cogging

i am planning on sending it in to get replaced, as i feel its a very good system for racing, but i will stay out of long grass and never gear over 12/72


i just figured out my final drive ratios

1st version with revo trans close ratio and 15/40 was =18.9:1
2nd version g3r w/ emaxx trans in 2nd and 18/72 = 19.6

i am suprised it lasted the 15 or so runs it worked

which tells me that the center diff and lighter truck in version one helped me, it never thermalled and was about 1 pound or so lighter, but geared higher

when i get it back i will be geared 12/72
and i may also try to get the 6.5 motor for testing, and bashing