cajungt

Just curious, I bought a lightly modded (cold air, springs, strut twr brace, gears, svt anniv. wheels, flowcrapster muffs.) 02 prem. GT last Oct., ABS light stays on, trac. ctrl light stays on. ABS has been disabled (panic stops confirm). Speedo is reading 15 mph to high so (50= 2800 rpm in 3rd. -auto tranny- using GPS for true MPH). I've read on the forums that you need to adjust shift points for gearing. Under full throttle, dead stop or rolling, it seems to shift out w/ no issues. Shifting manually it'll jerk sideways spinning 2nd gear (as long as I keep it out the rev. limiter). Other than ABS light and speedo being off, should I have any concerns about the integrity of the tranny? As it seems to be shifting fine now. Thanks for any opinions.