What can I say? When you want a good QA person and want to see how things can be broken you come to me.
Running the Summit in the snow during my lunch hour the right rear wheel would no longer engage. Whether the rear diff is engaged or no no power is delivered to the wheel. The left rear wheel gets power when the rear diff is locked, and I can watch the servo and assembly move when I throw the switch on the controller. I believe I stripped the actual differential gears (5382X), but I won't know for certain until I get home tonight and rip the entire rear assembly apart. I'll update as I go.
So let this be a lesson to you all: Some parts do not survive overenthusiastic stupidity!
(Sorry to bust into your post Icbrink, but I wanted new visitors to this thread to get the scoop on your problem with the Summit (and the fix) without having to go all the way to the end of the thread --Pete)
Thanks for supporting the Summit, guys. Needless to say, we’re very disappointed about the broken-shaft issues, especially after the lengthy torture-testing we put the Summit through before giving it the OK for production. Unfortunately, it appears a small number of Summits came off the line with diff output shafts that are not up to our engineered spec. It is no more than a random, unexpected manufacturing issue. If you have a broken diff output shaft just call 1-888-TRAXXAS (872-9927), and we’ll get you taken care of. We have new shafts on hand to support you. There’s no reason to “drive in fear” of having a breakage issue. We designed the Summit to take the pounding that a truck like that begs to receive. Drive it with confidence and have some fun!!
For those of you replacing diff shafts, there are some shortcuts for removing the differentials from the Summit. At first glance it appears to be a monumental job, however the Revo platform the Summit is based on was originally engineered to be easy to service. Follow this link for a quick tutorial on the fast way to get the diffs out. We also made another troubleshooting article that gives details on how to replace the actual shaft. Find it here.
We believe the solution is at hand so we are going to go ahead and close the thread. If you have questions or concerns, give us a call.
Thanks again for supporting Traxxas.