Imo, the Tekno clutch is junk. I tried running one on my Revo conversion but found it to be unpredictable with the springs on; better without the springs but the shoes kept getting overheated and "glazed" rendering themselves useless. I'm running Tekno's long shank, double set screw pinions on my 8T now with Mike's mount and the diff turned back around to the stock direction; no more worries about the set screw on a single coming loose during a long main anymore. Like yours, my 4s conversions have all come in about a pound heavier than a comprable nitro. I'm using the heaviest springs(gray and purple iirc), stock pistons, and 50ft., 40rr on my fluids. Still experimenting with diff. fluids but so far I've liked 7,20,5 the best. Of coarse, different driving styles require different set ups. Hope that helps.......................