racelikustolitlx

I have a 3 speed in my 89 stang dont know what tranny it is c-4 c-6 ???? I took my brother out and hammered on it for a while less than a 4 mile round trip. first thing is the tranny will not kick down at all when you romp it runnin at any speed and it takes kickin the pedal throught the floorboard to get it to shift 3 times then you can settle down and cruize on the highway, 3500 rpm at 70 ( geared for the quater I belive). the engine is a mild 302, trickflow cam 499./510. , AFR 185 heads, rpm intake and holley carb... trannies are a black science to me. but back to the drive it was slipping throught the gears, not firm at all then on the turn around I had to baby it back to keep it from slippin what I am missing the TC is new and looks stock and the stall is factory thanks for the help guys