[mistercrash]

The summit axles have been good. They don't snap or break as easily as the U joint style shafts if your slipper happens to be set too tight. But they do wear out as quickly as the U joint shafts, and from what I've experienced, every part of the Summit shaft wears out at the same rate and get a lot of sloppyness. So thinking of rebuilding them by changing a couple parts only is futile as every part needs to be changed. Might as well get a whole new shaft. That's a big problem as Traxxas does not and don't seem to plan on selling the Summit shafts as complete units. You can only get them by buying the parts seperately and assembling them. It comes up to over $20 per shaft. Expensive when you compare to the stock U joint shafts priced at just over $10. I'm on my second set of Summit shafts right now and they are starting to get a little slop to them so they are wearing out again. The only way to get complete Summit shafts is on ebay and they mostly sell them in pairs, one long shaft and one short one. You only need the long one so you're stuck with the short one. The short ones can be used but they have to be stretched to the point of almost breaking the rubber boot. This boot doesn't last long when it's stretched like that. I know I tried it. So yes the Summits are tougher but because they are not available at a cheap price, they are not really much of a good alternative and that's why I did not include them in my list of upgrades or mods. If you do try the MIP splines please let us know how they are as I've been eyeing those for a while.