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hi i bought this civic with the problem already so i took it to a mechanic and sayd to put a can of trans x in the transmission and drive it for a 100 milles and so i did and it solved the shifting problem it was good for about 5 months and then i it started again but now its worse the car has no strenght it feels very heavy it kinda shifts way before time but once im runing past 30 miles per hour its good and then sometimes it runs but before it shifts into 2 it kinda gets stuck and doesent go until i acelerate alot then it goes again i notice this problem started when i when to get the cv joint changed could this have something to do with this problem i really like my car and any help would help what causes improper shifthing ? the car idles ok i can reverse and park with no problem please help thanks

 
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Automatic right? This sounds exactly like what my 91 civic did. Though I thought Honda fixed the problem in 91 and the 92's and up didn't have the problem.

So first and second gear the engine revs load with no acceleration until it hits the point of shifting... hard shift at that.

Your front pump seal inside your transmission is leaking, causing it to lose pressure in low gears. It can be fixed but unless you know transmissions it will cost more then to get another from the salvage yard. I recommend just getting use to the shifting patterns, you can go awhile before it goes out. my 91 civic had 300k miles, same engine, third transmission. Did the same damn thing on everyone! And that's why I get my civics in a 5 speed now.

Take the car to a mechanic that knows his civic transmissions, call around. Then verify what I told you before making any big investments.