I'm going to guess you used an extension which would reduce the torque or you didn't use one of their bigger batteries, just the regular XC ones. They have a few other ones like high output HD batteries.I really thought for a while my Milwaukee impact was invincible with 1400 lbs of "nut busting torque". Nope. Could not get the strut bolts off a 2006 Altima. Could not get a control arm bolt off a 2003 Maxima. Had to resort to breaker bars. I'm using it a lot more now and the battery life is amazing