Will traxxas progressive springs stop the sag that the stock emaxx's have?
I don't think so, you have to shim them a little with the supplied shims. Trial and error will get you going in no time.
E-Maxx 150A and 2100kv 4-pole
They are better then the stock red springs, then use the spacers to adjust rode hight.
Look out for the tree/crunch!
LiPo? Naw NITRO!!