I have an 88 4wd that started a weird shake and louder engine noise last week. When the car is traveling at 25 to 35 mph the car will shake in the engine seems to be louder. This will happen when I accelerate up to 25 through 30 mph, but also when I am coasting back down when I hit those speeds. I have tried to re-create it by revving the engine or accelerating super fast, but the only time it happens is around 25 mph. Once I get any faster or slower this noise and shake go away. The car show is fine and the clutch was recently replaced. I have no problems shifting downshifting or at any other speeds. Does anyone have any ideas what to search for?