Thanks paul... would a say 12 tooth not be under geared for a 44 spur tho? Also I am still a bit confused as to why it set on fire.... I only drove out my garden gate , not even 30 seconds run, the things that were diffrent from my last run are the new turnigy 5000 40c 3s bats bullit proof front and rear diff and alza center diff, as I said I dont know the gearing in the diffs but he did say it was going to be quicker than my stock. All was unused and new of chap on ebay which I collected. Does any one think the esc should have handeld them bats or not?