A buddy and I just finished some work on my vehicle. We replaced the following:l/r axle seal, l/r axle bearing, rear brake shoes, l/r wheel cylinder, brake hardware, gear oil, diff cover gasket, brake fluid, turned drums, new tranny kit, rear tranny seal, rear pinion seal valce cover gaskets, power steering pump, drive belt, m/c, brake reservoir, and flushed brake fluid. When the work was completed, I noticed that when I accelerate past 40, the vehicle vibrates. It feels like I am driving over small speed bumps. We cannot figure out what is causing this. Does anyone have a clue? Thanks.