I have a 1994 Accord EX (Automatic transmission) which runs fairly well but there are a couple problems with it. First off, my speedometer is off by 10 mph (If the speedometer was saying that I was going 45 mph I would only be going 35 Mph). I was wondering how I could fix this (easy or not?). Also I believe there is a problem with my transmission. When the car shifts from 3rd to 4th gear the car revs a lot then switches to the next gear. The same thing happens when I am driving and my car wants to downshift (Revs a lot before dropping gears). Please help me out and explain what I could do to fix these problems. Thanks in advance!