I have built many kits in the past, and I'm confident that the build went just as instructed. The only thing I did that deviated from the instructions was to go with different fluids in the shocks and diff. I don't think any of these changes could explain all the problems I have had with this truck. When the truck actually runs it's a blast to drive, the problem is it won't run long enough without something breaking. I'm not bashing this thing either. I haven't been able to run it long enough. Most of the time it has been run in the driveway just to test it out and check for overheating issues that I've been having with it. Currently it's set up with a MM esc, a 4800kv excelorin motor, 87/16 gearing, and powered by a common sense 2S 5200mah lipo.