My Civic 2002 Prosmatec has issues in gear shifting. The engine is perfect but it seems like there is a problem in gear shifting in D3 and 2 while climbing steep hills. The car usually loses power and crawls while going up steep hills. A few days ago, I was going to Monal restaurant; it was literally crawling on some of the steep curves when I shifted it to d3 and then 2. It seems like the 1st gear wasn't engaging. It has 1600 cc engine and it shouldn't be behaving like this as most of the other cars like Mehran and alto were going up the hill without any struggle. I had changed the gear box (Kabli) two months ago when the previous one failed. It works fine on plain road. What can be the possible solution to this problem?? As a matter of fact, I have noted that whenever I drive it in D3 on plain road, I dont see any shifting in D3, no matter how hard I press the accelerator. The RPM goes up to 5500 k and still it doesn't shift in to the next gear. I dont use D3 quite often. In D the gear shifting is smooth and normal. My assumption is that there is a shifting problem in D3 and 2. Can anyone help me?? It would be really appreciable.