I've been fighting with this truck since I bought it the rear end has been super squirly. Yesterday I installed some worn calibers in the front and left super soft enduros in the rear wow all.of a sudden I could actually hit full throttle coming out of the corners and down the straight without the rear trying to come around. I was on a small dry track hard packed dirt sand real.dusty almost lime ice very slick. I will. See if it was coincidnce or a fix when I go back to.the big 1/8 track wednesday night. Fingers crossed it was the tires. Would putting the 19t pulley on the front have the same effect. Im assuming less grip in the front calmed the rear down? Would lighter diff fluid do the same in the front 30000 installed now with 5 in the rear