I hear about everyone breaking their diffs and other stuff breaking, I have not broken a single part. I had this truck since it was released and I have not had to do one thing to the Summit except clean it off after dirty runs. The truck has been everywhee rocks,track,park, ice plants. This is the first rc viechle I have had that have gone more than a couple months without breaking anything, and I run everyweekend. I only shift and unlock while moving slowly never while speeding or dead stop.