Hello, I own a 95 mustang GT Automatic it has some bolt-ons. GT40 intake, full exhaust, underdrive pullies. Last week when i got off of work i was taking off to drive home, and noticed the car acting sluggish. I stopped at a light, took off normal, and could tell it was taking off in second gear, it wouldnt really go over 2k rpm until i was at about 25-30mph. So I get close to my house, and stop at a stop sign, put it in 1st gear manually and it just revved, it barely inched up a little, felt as if the front brakes were locked stopping the car from going, i didnt try to take off hard, just a normal take off and it wouldnt go. I can definately feel it's taking off in second gear instead of first. Can anyone help me? Was thinking of a rebuild, buying a whole transmission. Wondering if first gear went out completely, or if it could be something else. Would a transmission fluid/filter change be any help?